The Montezuma site has all the dimensions and what goes where. You could take a look for ideas and scale it to your box. I like that style a lot. Simple to build compared to messing with drawers and sliders.
Found some time to do a bit more work on the inside, got the ratchet, extension, and screwdriver hold all done, got two mounting for my air tools done just need to do two more.
The box is 36" long 21" deep and 22" high, the only reason I made is this size was I used old bits of steel we had in the shop. So that determined the size I could make it.