OK here is my gutted UP. Talk about hours of work. It was hard because it had already broken lose of the sides when I got it and would just spin when the drill was applied. I got all that I could think of off with a wire wheel. Let me know if it looks good enough to put in. I knicked the sides a little bit with the drill and chisel, but I doubt that it will affect it.
It looks clean, but I cannot stress enough how sure you have to be that there is nothing left inside.