Riveted the Electric Trim Access Coverplate retention nutplates to the Lower Skin Reinforcement. Elected to use the pneumatic squeezer rather than my rivet gun and the back riveting plate. The pneumatic squeezer is certainly capable but I think this is a case where back riveting would be a better method. At least, it would certainly minimize the chance of doing what I did which was squeeze a rivet with thenutplate not flush to the reinforcement. I drilled out the offending rivet and replaced it with another rivet.
Riveting Nutplates Onto the Lower Reinforecement Plate
Riveting Nutplates Onto the Lower Reinforecement Plate