After a lesson of solid drawing and planning I had a pretty good manufacture session last night. I've bolted some steel plates through slots in the floor that I cut last time.  These plates then have 3mm box section welded on to form a frame.  This will form the mounting point for the universal joint - when I finally get round to making it!  Aside from some slightly dodgy welding in places (it's been a while) and a burnt hand (I tried to turn it over by picking up the end I'd just welded...) I think it went well!