This is the only thing stopping me from releasing a update to the mod. Can some who knows how to texture please help.
You should switch from flat shading to smooth shading for the panels. You should not do things like placing a materials.cs file in a path like "vehicles\fullsize\materials\materials.cs" because it will conflict with other mods. Instead a better place would be "vehicles\burilkovdeni\fullsize\fullsizesqr\materials.cs" or similar. Personally I prepend my forum name onto the front of all of my jbeams in order to really help prevent any collisions. Here's what I mean about the shading: I'm not a Blender guru but your problem seems to be this extra thing you've added called "Render Result". If you click on the "x" which says Unlink datablock like I show in the below screenshot you'll be able to see your UV again. After that export your DAE and the problem should be fixed.