Is there a way of combining this mutant skin with the one Jotisz was
playing with? There's a danger of these not looking right in game, and currently no easy way to test them until we've got a rigged Supermutant that can be inserted into the game properly - though I think what Jotisz was testing here should work. If you develop the "high-def" texture based on lighting and position of the "sprite texture", then there's a very high chance of it looking right in game. Otherwise, these are looking very promising. Some nice ideas and variations in there. Good work.
Regardless, make sure you keep all the PSD (or equivalent) source files, so they can be tweaked and adjusted as necessary once we've got the texture stuff sorted - and then tweaked again if we alter the lighting / shaders in future.
Regarding test rigs and stuff, if there's any chance of getting one of Jotisz's rigs out of Blender and into game, that'd be a massive help. I'm quite a long way from getting to the supermutant - currently I'm about 60% through the "peasant man" shape. Needs a bit of further tweaking until it aligns properly, but should have "guideline" forms there next time I've got a few hours to spare. There's my recent ingame test shots here :
Needs tweaking for shoulder/head/leg position, but once that's done, I can projection paint the sprites onto them properly, and we'll have some guideline textures to work from. Bear in mind things like the hat will only be "painted on", but you'll be able to use the guideline texture to position and shape it accurately. Once that's done, judging by the speed you're working at the moment, you can probably produce the proper ones of these in a day or two
[edit] Also, I'm testing some further stuff with the "hero" model, to analyse the engine lighting, and remove the equivalent from the texture, so we shouldn't have any "double shadow" in there. There's a few other bits I'm testing, but if it all works, things are going to be much easier pretty soon.