diff --git a/models/cuboid/src/lib.rs b/models/cuboid/src/lib.rs
index d0e6024ba..5fbde0a80 100644
--- a/models/cuboid/src/lib.rs
+++ b/models/cuboid/src/lib.rs
@@ -1,49 +1,25 @@
 use fj_kernel::{
     algorithms::sweep::Sweep,
-    geometry::region::Region,
-    objects::{Cycle, HalfEdge, Sketch, Solid},
-    operations::{BuildCycle, BuildHalfEdge, Insert, UpdateCycle},
+    objects::{Sketch, Solid},
+    operations::{BuildSketch, Insert},
     services::Services,
     storage::Handle,
 };
-use fj_math::{Point, Vector};
-use itertools::Itertools;
+use fj_math::Vector;
 
 pub fn cuboid(x: f64, y: f64, z: f64) -> Handle<Solid> {
     let mut services = Services::new();
 
-    let sketch = {
-        let exterior = {
-            #[rustfmt::skip]
-            let rectangle = [
-                [-x / 2., -y / 2.],
-                [ x / 2., -y / 2.],
-                [ x / 2.,  y / 2.],
-                [-x / 2.,  y / 2.],
-            ];
-
-            let mut cycle = Cycle::empty();
-
-            let segments = rectangle
-                .into_iter()
-                .map(Point::from)
-                .circular_tuple_windows();
-
-            for (start, end) in segments {
-                let half_edge =
-                    HalfEdge::line_segment([start, end], None, &mut services)
-                        .insert(&mut services);
-
-                cycle = cycle.add_half_edges([half_edge]);
-            }
-
-            cycle.insert(&mut services)
-        };
-
-        let region = Region::new(exterior, Vec::new(), None);
-
-        Sketch::new([region]).insert(&mut services)
-    };
+    let sketch = Sketch::polygon(
+        [
+            [-x / 2., -y / 2.],
+            [x / 2., -y / 2.],
+            [x / 2., y / 2.],
+            [-x / 2., y / 2.],
+        ],
+        &mut services,
+    )
+    .insert(&mut services);
 
     let surface = services.objects.surfaces.xy_plane();