Add Raised Square Frames to STEP

I have two STEP files in hand: the current model with a blank, flat surface and an older version that already carries the raised, rounded-corner square frames I want. Your job is simply to migrate that feature—two large and 2 medium rounded squares—from the old file to the new one. Keep every dimension, corner radius, and height exactly as shown in the reference model; the only difference is that I would like the adjacent rounded square lines to overlap (see picture). I only need the back four rounded squares added. They will be added to the underside of the part, just like the old part. You can work in SolidWorks, AutoCAD, Fusion 360, or any other CAD package you prefer. All I need back is a clean STEP file that opens error-free. Acceptance check: • Frames match the reference within ±0.01 mm for size and height • Fillets remain consistent with the original radius • No additional surfaces or artefacts introduced • File returns successfully as a single, watertight solid in STEP format Once those points are met, the project is complete.

Projektin tunnus (ID): 40205511