Finished the AN470 4-4 rivets around the perimeter of the Left Seat Floor pan. Boy, those that are on the outboard edge are a !#$%#@!, I could barely get my arm in between the inboard rib and the skin to buck, I think it will take a few days for the bruises to heal. On the rear flange, Van could have planned the rivet layout a little better, 3 or 4 of the rivets, are right next to the seat ribs which make bucking them a challenge.. Anyway, got all of that done and then finished with the pop rivets on the rear seat pans. Installed the nutplates around the inboard and fwd edges of the seats, and then the 426 4-4's arouns the same areas. Match drilled, primed and riveted the F1034B Seat Back Brace to the seat back.