Confirm construction intentDecide whether the 35 shells, open tube ends, and detached-looking small piece are authored parts or cleanup defects.
Clean verified defectsRemove the 6 degenerate faces and weld coincident vertices only where doing so preserves intended seams and separate parts.
Apply transforms on a copyNormalize scale and rotation, then compare world dimensions and silhouette against the original before export.
Select the bake UVStart with UVChannel_1, then run overlap, padding, and checker-density validation before AO or normal baking.