diff --git a/src/dsn/de.rs b/src/dsn/de.rs
index 6735941..3de4c93 100644
--- a/src/dsn/de.rs
+++ b/src/dsn/de.rs
@@ -1,6 +1,6 @@
 use std::fmt;
 
-use serde::de::{self, DeserializeSeed, SeqAccess, EnumAccess, VariantAccess, Visitor};
+use serde::de::{self, DeserializeSeed, EnumAccess, SeqAccess, VariantAccess, Visitor};
 use serde::Deserialize;
 use thiserror::Error;
 
@@ -88,9 +88,9 @@ impl<'de> Deserializer<'de> {
     fn keyword_lookahead(&self) -> Option<String> {
         let mut iter = self.input.chars();
         if let Some('(') = iter.next() {
-            Some(iter
-                .take_while(|c| c != &' ' && c != &'\r' && c != &'\n')
-                .collect::<String>()
+            Some(
+                iter.take_while(|c| c != &' ' && c != &'\r' && c != &'\n')
+                    .collect::<String>(),
             )
         } else {
             None
@@ -387,9 +387,9 @@ impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
     where
         V: Visitor<'de>,
     {
-        let elem_type = self.vec_type.expect(
-            "fields of type Vec<_> need to have names suffixed with _vec"
-        );
+        let elem_type = self
+            .vec_type
+            .expect("fields of type Vec<_> need to have names suffixed with _vec");
 
         visitor.visit_seq(ArrayIndices::new(self, elem_type))
     }
@@ -461,7 +461,10 @@ impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
         V: Visitor<'de>,
     {
         self.skip_ws();
-        visitor.visit_string(self.parse_string().map_err(|err| DeError::ExpectedKeyword)?)
+        visitor.visit_string(
+            self.parse_string()
+                .map_err(|err| DeError::ExpectedKeyword)?,
+        )
     }
 
     fn deserialize_ignored_any<V>(self, _visitor: V) -> Result<V::Value>
@@ -515,11 +518,7 @@ impl<'de, 'a> VariantAccess<'de> for Enum<'a, 'de> {
         todo!();
     }
 
-    fn struct_variant<V>(
-        self,
-        _fields: &'static [&'static str],
-        _visitor: V,
-    ) -> Result<V::Value>
+    fn struct_variant<V>(self, _fields: &'static [&'static str], _visitor: V) -> Result<V::Value>
     where
         V: Visitor<'de>,
     {
@@ -554,9 +553,10 @@ impl<'de, 'a> SeqAccess<'de> for ArrayIndices<'a, 'de> {
             // anonymous field
             seed.deserialize(&mut *self.de).map(Some)
         } else {
-            let lookahead = self.de.keyword_lookahead().ok_or(
-                DeError::ExpectedOpeningParen(self.elem_type)
-            )?;
+            let lookahead = self
+                .de
+                .keyword_lookahead()
+                .ok_or(DeError::ExpectedOpeningParen(self.elem_type))?;
             if lookahead == self.elem_type {
                 // cannot fail, consuming the lookahead
                 self.de.next().unwrap();
diff --git a/src/dsn/design.rs b/src/dsn/design.rs
index bfeff89..b2adc32 100644
--- a/src/dsn/design.rs
+++ b/src/dsn/design.rs
@@ -9,7 +9,7 @@ use crate::{
 
 use super::{
     de,
-    rules::Rules,
+    rules::DsnRules,
     structure::{DsnFile, Pcb, Shape},
 };
 
@@ -24,7 +24,6 @@ pub enum LoadingError {
 #[derive(Debug)]
 pub struct DsnDesign {
     pcb: Pcb,
-    rules: Rules,
 }
 
 impl DsnDesign {
@@ -34,21 +33,22 @@ impl DsnDesign {
             .map_err(|err| LoadingError::Syntax(err))?
             .pcb;
 
-        let rules = Rules::from_pcb(&pcb);
-
-        Ok(Self { pcb, rules })
+        Ok(Self { pcb })
     }
 
-    pub fn make_layout(&self) -> Layout<&Rules> {
-        let mut layout = Layout::new(&self.rules);
+    pub fn make_layout(&self) -> Layout<DsnRules> {
+        let rules = DsnRules::from_pcb(&self.pcb);
+        let mut layout = Layout::new(rules);
 
         // mapping of pin id -> net id prepared for adding pins
         let pin_nets = HashMap::<String, i64>::from_iter(
-            self.pcb.network.net_vec
+            self.pcb
+                .network
+                .net_vec
                 .iter()
                 .map(|net| {
                     // resolve the id so we don't work with strings
-                    let net_id = self.rules.net_ids.get(&net.name).unwrap();
+                    let net_id = layout.rules().net_ids.get(&net.name).unwrap();
 
                     // take the list of pins
                     // and for each pin id output (pin id, net id)
@@ -85,10 +85,7 @@ impl DsnDesign {
                     match &padstack.shape_vec[0] {
                         Shape::Circle(circle) => {
                             let circle = Circle {
-                                pos: (
-                                    (place.x + pin.x) as f64,
-                                    -(place.y + pin.y) as f64
-                                ).into(),
+                                pos: ((place.x + pin.x) as f64, -(place.y + pin.y) as f64).into(),
                                 r: circle.diameter as f64 / 2.0,
                             };
 
@@ -114,7 +111,7 @@ impl DsnDesign {
             .via_vec
             .iter()
             .map(|via| {
-                let net_id = self.rules.net_ids.get(&via.net).unwrap();
+                let net_id = layout.rules().net_ids.get(&via.net).unwrap();
 
                 // find the padstack referenced by this via placement
                 let padstack = &self
@@ -147,12 +144,12 @@ impl DsnDesign {
             .collect();
 
         for wire in self.pcb.wiring.wire_vec.iter() {
-            let net_id = self.rules.net_ids.get(&wire.net).unwrap();
+            let net_id = *layout.rules().net_ids.get(&wire.net).unwrap();
 
             // add the first coordinate in the wire path as a dot and save its index
             let mut prev_index = layout
                 .add_fixed_dot(FixedDotWeight {
-                    net: *net_id as i64,
+                    net: net_id as i64,
                     circle: Circle {
                         pos: (
                             wire.path.coord_vec[0].x as f64,
@@ -168,7 +165,7 @@ impl DsnDesign {
             for coord in wire.path.coord_vec.iter().skip(1) {
                 let index = layout
                     .add_fixed_dot(FixedDotWeight {
-                        net: *net_id as i64,
+                        net: net_id as i64,
                         circle: Circle {
                             pos: (coord.x as f64, -coord.y as f64).into(),
                             r: wire.path.width as f64 / 2.0,
@@ -182,7 +179,7 @@ impl DsnDesign {
                         prev_index,
                         index,
                         FixedSegWeight {
-                            net: *net_id as i64,
+                            net: net_id as i64,
                             width: wire.path.width as f64,
                         },
                     )
diff --git a/src/dsn/rules.rs b/src/dsn/rules.rs
index 50ed3f6..d891509 100644
--- a/src/dsn/rules.rs
+++ b/src/dsn/rules.rs
@@ -5,12 +5,12 @@ use crate::layout::rules::{Conditions, RulesTrait};
 use super::structure::Pcb;
 
 #[derive(Debug)]
-pub struct Rule {
+pub struct DsnRule {
     pub width: f64,
     pub clearance: f64,
 }
 
-impl Rule {
+impl DsnRule {
     fn from_dsn(rule: &super::structure::Rule) -> Self {
         Self {
             width: rule.width as f64 / 100.0,
@@ -20,10 +20,10 @@ impl Rule {
 }
 
 #[derive(Debug)]
-pub struct Rules {
-    structure_rule: Rule,
+pub struct DsnRules {
+    structure_rule: DsnRule,
     // net class name -> rule
-    class_rules: HashMap<String, Rule>,
+    class_rules: HashMap<String, DsnRule>,
 
     // net names -> net IDs for Layout
     pub net_ids: HashMap<String, i64>,
@@ -31,7 +31,7 @@ pub struct Rules {
     net_id_classes: HashMap<i64, String>,
 }
 
-impl Rules {
+impl DsnRules {
     pub fn from_pcb(pcb: &Pcb) -> Self {
         // keeping this as a separate iter pass because it might be moved into a different struct later?
         let net_ids = HashMap::from_iter(
@@ -54,18 +54,18 @@ impl Rules {
                         net_id_classes.insert(*net_id, class.name.clone());
                     }
                 })
-                .map(|class| (class.name.clone(), Rule::from_dsn(&class.rule))),
+                .map(|class| (class.name.clone(), DsnRule::from_dsn(&class.rule))),
         );
 
         Self {
-            structure_rule: Rule::from_dsn(&pcb.structure.rule),
+            structure_rule: DsnRule::from_dsn(&pcb.structure.rule),
             class_rules,
             net_ids,
             net_id_classes,
         }
     }
 
-    pub fn get_rule(&self, net: i64) -> &Rule {
+    pub fn get_rule(&self, net: i64) -> &DsnRule {
         if let Some(netclass) = self.net_id_classes.get(&net) {
             self.class_rules
                 .get(netclass)
@@ -76,7 +76,7 @@ impl Rules {
     }
 }
 
-impl<'a> RulesTrait for &'a Rules {
+impl RulesTrait for DsnRules {
     fn clearance(&self, conditions1: &Conditions, conditions2: &Conditions) -> f64 {
         let clr1 = self.get_rule(conditions1.net).clearance;
         let clr2 = self.get_rule(conditions2.net).clearance;