Right the lump of a Hull is in Mr surfacer black primer, however it would not fit in my large booth so.
After trying all sorts of ideas to make a spray booth extension, cardboard box, various cut up plastic storage boxes, no good and of course no extraction, so bit the bullet and bought the smaller version of my large booth, with light and cobbled them together.
Not perfect but packed gaps with bubble wrap and hey presto, plenty of space now
Here goes
Pleased with finish, however some of the faint details on the hatches has gone, bugger! Next grey bum!