Build a GMod ride using Scrap Mechanic part rules.
A single-player Garry’s Mod addon and launcher that reads the installed Scrap Mechanic seat, engine, and small wheel identities and tuning. Spawn them from Q → Utilities → SM Garage, weld a vehicle with GMod’s Weld tool, use the seat, then hold W/S to drive the assembly. GMod stock props provide the visible physics bodies; no Scrap Mechanic game assets are included. Requires both games installed on Windows.