Brenutz,
I have found little difficulty in using those textures for Piglet's Fi-156 Storch. The only thing you have to remember is to check the format of the bitmaps with Martin Wright's DXTbmp, and changing any that are Extended bitmap 32, because the textures show up as transparent in CFS2. Switching them to DXT3 will suffice. Other than that, you should have no problems.
I just used the Finnish 1940 repaint on my Eastern Front Storch.
In the past, I've found skins for Thicko's Ms-406 that put her in the colors of the Regia Aeronautica, as well as the Mermaz Dewoitine D-520.