Well I've begun. Simple prep stuff so far while I had a few hours, managed to get the windows glued back in that were removed, filled the gaps round them and filled in some large panel gaps round the top. Didn't realise how quick you have to be with the green putty, it starts to dry the second its out the tube. A few pics below...
Window sections re-glued in, and first application of filler applied.
Docking ports correctly sized using 7/32" tubing, obviously ill fill the edges.
Masking off ready to apply filler to the large panel gap.