as said uvs are relative, which mean relative to mapping size.
If you change ratio or scale or whatever of a map, the relative position of an uvmap always remain the same.
uvmaps are relative, and not absolute.
to cause displacement of details, you have to crop or add row of pixels or other similar operations
I admit that I'm not sure if I tryed to resize not proportionally in the past, but IIRC yes, many times ago, and everything worked fine, but as said I'm not sure.
What I'm saying is mostly from what I know about uvmaps, and as Stratcomm is saying, it's working fine for him, so..
Let me also say that a detail displacement should look different than what you have in the pics above
@stratcomm
there are issues with FREDopen and this model, you have to check page 2-3 of this thread to find a solution, thanks to Vasudan Admiral
@venom:
http://www.3dap.com/hlp/hosted/swfs2/wips/fenrisnouv.3dsthis is a non uvmapped version of the fenris, with all the submodels not merged, some minimal mesh differences in a couple of details and probably a cleaner model (I think that VA added some edges and changed some very minimal things to make it easyer to unwrap, he also reduced the depth of the windows under my suggestion), dunno if it could be useful to you
Just be careful if you want to make some deep modifications, cuz I spent a lot of time before having a stable version (no crashes, no flythrough)