Thanks for the comments!
I built it so it could be removed from the truck without too much fuss. The top slider pulls out, and the four side bins unbolt and lift out. Then the deck with drawers can slide out, but it weighs about 100 lbs. It would probably take me longer to pull all the junk out of the drawers and bins than to yank the whole assembly. One of these days I need to pull it all out and caulk those holes in the front of the bed (that thread about waterproofing the bed made me realize I forgot to do that!), and when I do that I might coat it with some polyeurethane before putting it all back together.
It took me about 2 1/2 days to build, but I've been planning the design in my head for a long time! I had something similar in my last truck, but there were always a couple of things that bothered me about the previous design.
I have a utility trailer, and use that for anything that is too big to fit under the canopy, but this arrangement of boxes and deck has worked well for a long time (daily driving, hunting, camping, road trips...) Tire chains are messy to deal with, and this keeps them out of the way (but easily accessible), and secure.
Watch enough Norm Abrams on PBS and you pick up quite a lot of wood working tips!
Cheers!