Have the solar mounted, Maxair fitted, wall panels sanded and undercoated first 80 grit then 120 then 240 grit in-between coats . The same with the hardwood ply panels. Start the top coat tomorrow and dry fitting to cut the holes for the wiring. Have also started fitting the insulation to the back of the timber panels. Much easier than connecting to the steel and if the panels ever require removing everything peals away with one section.