Looking good.

Also, I'll second (third?) the recommendation for using PEM nuts. We use them at my work on our sheet metal chassis, and they're wonderful to deal with. Out of 75 robots, we had one PEM nut pop loose, and the shop that pressed them fixed it for us in less than 6 hours. PEM nuts are the way to go.

How many parts in there are standardized? It's always easier for a sheet metal shop to punch out and break more similar parts than differing ones.