Cool idea for texture, a bit realistic too since rockets sent to space usually have coating made of ceramic plates that protect them from high temperature (not sure if the info is outdated and they haven't found better thermal protection, been a while since I seen anything space related).
I already have blender for iqm export, worked with it for quite a while too. However, working with Wings feels much better for me (and I already tried other software: gmax, 3ds max, lightwave, milkshape, some sculpting tools). For modeling, nothing works quite like wings. I think it exports to obj too.
If I'll make obj as levels, then I'll be modelling them with wings and tweaking with blender (texturing mostly).