#rotation

A primitive authored with a rotation parameter spins about its own object origin, wherever it was placed, not about the part's intended pivot. A raked hood then see-saws about its own middle and shows half the intended wedge in each direction. Rotate the placement coordinate around the pivot first, then place the box there with the same rotation baked in, and remember that a rotated box's own bounding box is trigonometric, not its declared half-length.

Rotation.FromYaw alone leaves a decal flat on the floor: build a rotation that aligns the thin axis to the surface normal, then offset along it.

Rotation.FromYaw(+angle) is a LEFT (CCW) turn. Get the sign right or steering, AI, and autopilot spiral the wrong way.