More so than just the Supermutant, it's more the fact that we've managed to get an export from Blender working. They've always come out heavily corrupt or incompatible in the past - and there's lots of work that Lizard, Jotisz and others had done which we were unable to do anything with. From what I tested so far, I got the cleanest results from the fbx export, which seemed to import into Fragmotion seamlessly (so I could compare size against existing model, but also that's pretty much confirmation that it'll work in game).
Personally I'd leave the thread open - even though it's gone off topic a little, there's some useful things being discussed here (or we could merge this one and the other one into the "armours and clothing" and "3D models development" threads).