Youre supposed to mount all 4 corners with clecos first and the rivet them, i dont have enough clecos so i have to go very slowly ahead and move all clecos a corner at a time.
Pain in the ass, but.
But today i got all corner skin and front corner skins deburred and painted, ohh and bottom skin was also mounted, puuh, these big surface are really hard to work with, i bought new lightning so i actually can see what i do to.