Finally got him finished last night. Not sure how long it took from start to finish as I work on several models at once. I find working in that way stops me ruining what I have sculpted until it's fully hardened.
The disc is fully scratch built, the armature was a piece of plasticard cut to shape with 30mm laser cut 1.5mm thick wooden discs glued to either side. It is also magnetised to the stand for easier storage.