Ok so I go the SP U25 working. Now I'm reskinning it to MEC livery. So now here's the problems....
 
 
 
 
 
I can't figure out how to change the front of the loco. There is no .TGA file to skin so I'm lost with that. 
 
Second is the bottom picture. That's the few from the cab looking toward the rear of the loco. How do I get it to change to the reskin? Thanks.
 
-Joe