diff --git a/modeling-cmds/src/convert_client_crate.rs b/modeling-cmds/src/convert_client_crate.rs
index 54c12778..7709ad66 100644
--- a/modeling-cmds/src/convert_client_crate.rs
+++ b/modeling-cmds/src/convert_client_crate.rs
@@ -141,9 +141,13 @@ mod format {
                 InputFormat::Sldprt(sldprt::import::Options { split_closed_faces }) => {
                     kt::InputFormat::Sldprt { split_closed_faces }
                 }
-                InputFormat::Step(step::import::Options { split_closed_faces }) => {
-                    kt::InputFormat::Step { split_closed_faces }
-                }
+                InputFormat::Step(step::import::Options {
+                    coords,
+                    split_closed_faces,
+                }) => kt::InputFormat::Step {
+                    coords,
+                    split_closed_faces,
+                },
                 InputFormat::Stl(stl::import::Options { coords, units }) => kt::InputFormat::Stl {
                     coords: coords.into(),
                     units: units.into(),
@@ -168,9 +172,13 @@ mod format {
                 kt::InputFormat::Sldprt { split_closed_faces } => {
                     Self::Sldprt(crate::format::sldprt::import::Options { split_closed_faces })
                 }
-                kt::InputFormat::Step { split_closed_faces } => {
-                    Self::Step(crate::format::step::import::Options { split_closed_faces })
-                }
+                kt::InputFormat::Step {
+                    coords,
+                    split_closed_faces,
+                } => Self::Step(crate::format::step::import::Options {
+                    coords,
+                    split_closed_faces,
+                }),
                 kt::InputFormat::Stl { coords, units } => Self::Stl(crate::format::stl::import::Options {
                     coords: coords.into(),
                     units: units.into(),
diff --git a/modeling-cmds/src/coord.rs b/modeling-cmds/src/coord.rs
index d9781873..9ee4e80a 100644
--- a/modeling-cmds/src/coord.rs
+++ b/modeling-cmds/src/coord.rs
@@ -168,10 +168,13 @@ pub const VULKAN: &System = &System {
 /// assert_eq!(b, [1.0, -2.0, 3.0]);
 /// ```
 #[inline]
-pub fn transform(a: [f32; 3], from: &System, to: &System) -> [f32; 3] {
+pub fn transform<T>(a: [T; 3], from: &System, to: &System) -> [T; 3]
+where
+    T: Copy + From<i32> + std::ops::Mul<Output = T>,
+{
     let mut b = a;
     b[to.forward.axis as usize] =
-        (from.forward.direction * to.forward.direction) as i32 as f32 * a[from.forward.axis as usize];
-    b[to.up.axis as usize] = (from.up.direction * to.up.direction) as i32 as f32 * a[from.up.axis as usize];
+        T::from((from.forward.direction * to.forward.direction) as i32) * a[from.forward.axis as usize];
+    b[to.up.axis as usize] = T::from((from.up.direction * to.up.direction) as i32) * a[from.up.axis as usize];
     b
 }
diff --git a/modeling-cmds/src/format/step.rs b/modeling-cmds/src/format/step.rs
index 1f6d61dc..ee7284c0 100644
--- a/modeling-cmds/src/format/step.rs
+++ b/modeling-cmds/src/format/step.rs
@@ -9,17 +9,33 @@ pub mod import {
     use super::*;
 
     /// Options for importing STEP format.
-    #[derive(Clone, Debug, Default, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema, Display, FromStr)]
-    #[display("split_closed_faces: {split_closed_faces}")]
+    #[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize, Deserialize, JsonSchema, Display, FromStr)]
+    #[display("coords: {coords}, split_closed_faces: {split_closed_faces}")]
     #[serde(default, rename = "StepImportOptions")]
     #[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
     #[cfg_attr(feature = "ts-rs", ts(export_to = "ModelingCmd.ts"))]
     pub struct Options {
+        /// Co-ordinate system of input data.
+        ///
+        /// Defaults to the [KittyCAD co-ordinate system].
+        ///
+        /// [KittyCAD co-ordinate system]: ../coord/constant.KITTYCAD.html
+        pub coords: coord::System,
+
         /// Splits all closed faces into two open faces.
         ///
         /// Defaults to `false` but is implicitly `true` when importing into the engine.
         pub split_closed_faces: bool,
     }
+
+    impl Default for Options {
+        fn default() -> Self {
+            Self {
+                coords: *coord::KITTYCAD,
+                split_closed_faces: false,
+            }
+        }
+    }
 }
 
 /// Export models in STEP format.