Create STEP CAD File for Injection Molded Plastic Slab (LEGO Display Case)

I am looking for a CAD designer to create a STEP file for a plastic display slab designed to hold a LEGO minifigure. I have: concept images dimensions a rough 3D reference model The goal is to create a clean, manufacturing-ready CAD model suitable for injection molding. Requirements: Create a 3D CAD model and deliver a STEP file (.step/.stp) Include proper wall thickness Include basic draft angles for injection molding Add fillets (rounded edges where appropriate) Design as a two-part assembly (front shell and back plate) for ultrasonic welding Approximate dimensions: Overall slab (PSA-compatible footprint): Height: 5 3/8 in Width: 3 3/16 in Depth: 1 1/2 in Internal figure chamber: Height: 2 7/8 in Width: 2 1/4 in Depth: 1 1/4 in Wall thickness: Side frame: ~1/4 in Front wall: 1/8 in Back wall: 1/8 in Notes: The slab will be made from clear plastic (polycarbonate), so smooth surfaces are important The design should be simple and clean, similar to a grading slab (PSA-style) The slab should match PSA slab height and width for compatibility with storage systems, but be thicker to accommodate a LEGO minifigure No complex mechanisms required Please confirm: You can deliver a STEP file suitable for manufacturing You understand basic injection molding requirements (draft angles, wall thickness, etc.) I will provide all reference images and details after hiring.