Spent a little more time prepping the tray and making a block of wood that fit perfectly in the tray and supported the flange. Also, even though the direction call out to rivet the doublers on first before final sizing, I just held them in place with clecos and match marked everything. I wanted to be able to clean out the chips and deburr the edges slightly. The drill press worked great. It turned out real nice, although I still haven't pressed in the bushings.
Drill press was a much beeter way to final size the .25 holes
