Filling in the blanks here where I was too lazy to post after a project. Rear drawer system done!

 Frame is 3/4" square tube topped with 3/4" birch ply wood, drawers made of birch as well.

 These suckers can hold a TON of crap!

 Drawer faces are 10 gauge steel recovered from an old file safe, the handles were from Zoro and welded into the face

 Top is covered with what is called a "roof mat" usually when AC units are set on roofs of commercial buildings this is what they use cheap and tough as nails

 Wings on each side for more junk storage

 Thinking about redoing the design on the next set

A short video of the system