I spun up a fresh project, re-imported the FBX models of the TI, and set up a first/third-person player with keyboard toggle. There are no textures, no lights, and lots of meshes to fix. But I let go of over 8GB of kruft that had accumulated from messing around in the previous project. There’s probably a better way to clean out old gunk, but a full restart of a project should work.