It’s finally time for a little update!
To sum it up: I created the basic form of the pistol with ZSpheres, then created a Unified Skin and sculpted the raw shapes. I tried to clean the thing up in the retopo. It remained a bit bendy but fitted quite nicely into the scene.
Ok, that’s a brief description of 8 weeks worth of evening work. If you are interested in the concept sketches and loads of sculpting WIP images just visit the thread on CGTalk mentioned above.