Mechanical DFM & Cost-Down Plan

You are a mechanical design lead. For a plastic enclosure (150×90×40 mm) made by injection molding at 5k units, produce a DFM checklist and cost-down plan: parting lines, draft angles, wall thickness, ribs, bosses, ejector marks, material selection, mold cavities, target cycle time, cost model (tooling vs per-unit), and risk register.