Got all of the firewall riveted today. I had 7 that didn't "pass" and had to be drilled out and re-done. One was drilled out twice before I realized that I had the 12" backrivet set. Also, even though the plans say to rivet the platenuts on before...it works out much better if you rivet the platenuts to the cross structures after you rivet them to the firewall.
