checkerboard frame 3d model

A square frame based on the reference image. Create two layers: - A flat base layer (solid plate). - A top layer consisting of a wave-distorted checkerboard pattern placed on top of the base. The top pattern should follow a wavy shape in the XY plane only, but must have uniform height (constant thickness), no height variation. All surfaces must be flat and clean, with sharp edges and hard transitions. No smooth height deformation, no organic Z-axis displacement. 3D printable: solid, manifold mesh, proper thickness, no thin walls, no overhang issues.