Nice concept. Love to see The Enterprise Project designs in-game.
Cinqnic, I'd suggest, if you're using something like Photoshop or GIMP. Start with taking screen caps of the UPS version that's on
http://www.startrekmovie.com/modelgallery/ After that, copy the original Wiley's texture into a new file as the background image. Next, make a new layer and color the whole thing the same brown as TEP version (do that buy just using eyedropper), then put that layer at about 50% and erase where the windows are, once that's one, bring it back up to about 90%. Then make a new layer of the background; again, erase the window and smear out where any writing or hull paint is, then desaturate that layer. Then increase the contrast of it so that the main hull looks practically white and the hull detailing looks practically black. Then drop that layer down to about 20-40%.
^That should make it look a lot more like it's a stand alone thing as apposed to a simple recoloring.
Also, giving some time, I might just do the WWII styled ENT repaint from The Enterprise Project, with a slightly more interesting deflector (old school radar styling) and bussards (jet turbine intake).