Riveted Firewall

My step-father Curtis was in town and gave me a hand prepping the firewall components for priming and helped me back-rivet everything in place.  We had a little problem with one of the corners because the firewall wasn't sitting flat on the back rivet plate.  I drilled the problem rivets out though and everything looks great now.  Like many other builders, I had to go up a size on some of the rivets to get a sufficiently large shop head (though I don't think it would have mattered to just use the size called out for in the plans).