I'd guess it's the fact that that particular mesh (or meshes) has the dirt flag enabled. You'd need to edit the model/s to change it, but you need to flip some of the UVs anyway judging by your first pic.
Love the idea, but I get a CTD when I install the final repair part. Text indicates that the repair happens, then HK vanishes and I CTD. I can avoid the CTD by quickly bypassing the text. When I do this the camera pans back into the overhead view and I get a fade to black that never goes away, even though I can still access the game menu. I run a lot of mods, but not other HK mods that I am aware of. 🤨