Completion

req_001: Create one connected mounting plate in millimetres with a rectangular base and an integral vertical reinforcing rib. Use reasonable assumptions for the unlabeled dimensions: base 120 mm x 80 mm x 10 mm, rib 80 mm tall x 8 mm thick running along one long edge, and all edges blended only if needed for manufacturability.
req_002: Add four mounting through holes to the plate as an evenly spaced hole pattern suitable for mounting. Assume 6 mm hole diameter and place the holes symmetrically on the base so the pattern is repeatable and clearly distinct from the rib.