So I decided to spray bits of my rear end (oo er) so that I could get a better idea of the lumps and bumps that need rubbing down and/or filling. Then I got a bit carried away and did the whole thing...
I'm actually really pleased with how it's come out although there's definitely a few patches that need attention. However, what I can now do is wire up the front and rear lights and see if I can get it MOT'd!!