I’ve tried copying the UVs in Max/Maya and adding a new UV Channel. Then, I got it to reorganise them so nothing would be overlapping. Despite that though, it’s still complaining about overlapping UVs. :-\ The UVs for each piece are quite unusual from what I’ve seen before - I think they’ve been set this way for the purpose of tiling textures…?
And then the second channel I’ve set up, I’ve got it to Normalise/Scale everything:
