diff --git a/cimery/crates/kernel/src/abutment.rs b/cimery/crates/kernel/src/abutment.rs
index 68c4d25..e2cc595 100644
--- a/cimery/crates/kernel/src/abutment.rs
+++ b/cimery/crates/kernel/src/abutment.rs
@@ -20,27 +20,49 @@ pub fn build_abutment_mesh(ir: &AbutmentIR) -> Result<Mesh, KernelError> {
 
     let mut parts: Vec<Mesh> = Vec::new();
 
-    // Breast wall: along transverse (Z), thickness along span (X), height (Y)
-    parts.push(sweep::centred_box(0.0, bw_h * 0.5, bw_t * 0.5, bw_h * 0.5, bw_w));
-
-    // Footing: below grade, spans along X (span direction)
+    // Coordinate convention (bridge): X=transverse, Y=vertical, Z=along span
+    //
+    // Breast wall: WIDE along X (bw_w), TALL along Y (bw_h), THIN along Z (bw_t)
+    //   → profile in XY plane, swept bw_t along Z
     {
+        let hw = bw_w * 0.5;
         let profile = vec![
-            [-ft_l * 0.5, -ft_t],
-            [ ft_l * 0.5, -ft_t],
-            [ ft_l * 0.5,  0.0 ],
-            [-ft_l * 0.5,  0.0 ],
+            [-hw,  0.0 ],
+            [ hw,  0.0 ],
+            [ hw,  bw_h],
+            [-hw,  bw_h],
         ];
-        parts.push(sweep::sweep_profile_flat(&profile, ft_w));
+        parts.push(sweep::sweep_profile_flat(&profile, bw_t));
     }
 
-    // Wing walls (left and right)
-    for side in [&ir.wing_wall_left, &ir.wing_wall_right] {
+    // Footing: WIDE along X (ft_w), thin along Y (ft_t), LENGTH along Z (ft_l)
+    //   → profile in XY plane, swept ft_l along Z
+    {
+        let hw = ft_w * 0.5;
+        let profile = vec![
+            [-hw, -ft_t],
+            [ hw, -ft_t],
+            [ hw,  0.0 ],
+            [-hw,  0.0 ],
+        ];
+        parts.push(sweep::sweep_profile_flat(&profile, ft_l));
+    }
+
+    // Wing walls: extend transversely (±X) from abutment ends.
+    // Left wing: from X = -bw_w/2 extending further in -X
+    // Right wing: from X = +bw_w/2 extending further in +X
+    for (side, sign) in [(&ir.wing_wall_left, -1.0_f32), (&ir.wing_wall_right, 1.0_f32)] {
         let wl = side.length as f32;
         let wh = side.height as f32;
         let wt = side.thickness as f32;
-        // Simplified: vertical rectangle, oriented in XY, length along Z
-        parts.push(sweep::centred_box(0.0, wh * 0.5, wt * 0.5, wh * 0.5, wl));
+        // Profile in XY: length wl, height wh; swept wt along Z
+        let x_start = sign * bw_w * 0.5;
+        let x_end   = x_start + sign * wl;
+        let (xl, xr) = if x_start < x_end { (x_start, x_end) } else { (x_end, x_start) };
+        let profile = vec![
+            [xl, 0.0], [xr, 0.0], [xr, wh], [xl, wh],
+        ];
+        parts.push(sweep::sweep_profile_flat(&profile, wt));
     }
 
     Ok(sweep::merge_meshes(parts))
diff --git a/cimery/crates/viewer/src/lib.rs b/cimery/crates/viewer/src/lib.rs
index 79ca973..67f6afa 100644
--- a/cimery/crates/viewer/src/lib.rs
+++ b/cimery/crates/viewer/src/lib.rs
@@ -24,13 +24,10 @@ use winit::{
     window::{Window, WindowId},
 };
 use wgpu::util::DeviceExt;
-use cimery_core::{MaterialGrade, SectionType};
-use cimery_ir::{FeatureId, GirderIR, PscISectionParams, SectionParams};
 #[cfg(feature = "occt")]
 use cimery_kernel::OcctKernel;
 #[cfg(not(feature = "occt"))]
 use cimery_kernel::PureRustKernel;
-use cimery_kernel::GeomKernel;
 use camera::{Camera, StandardView};
 use glam;