Sixlug,
Nice looking shell! I bet that will make a great camping setup
Have you looked at some of the "chuck box" designs? What you are describing sounds to me like a chuck box but slightly modified to use while mounted in the truck.
I've installed two strips of aircraft track in my Tacoma between the bed ribs. I used the Mac's Customs track. It barely sticks up above the ribs so I still have the full bed functionality. Right now I just use it for tying gear down and for holding a removable bike rack. Eventually I plan to build a chuck box that will solid mount in my truck bed using a couple of the Mac's Customs m-10 threaded studs. When I'm back at home, undo a couple of nuts, remove the box, pull off the studs and I'm back to a smooth, usable truck bed. I plan to build a whole system similar to a Goosegear Tacoma Habitat setup but divided in several sections so that each piece will be small and light enough to still lift out by hand. If it gets too heavy I can always use a cherry picker to lift each section out.
If you make the kitchen module small enough that you can pull it out by hand, then when you're camping, pull it out, set it up and now you have an outdoor kitchen!
http://www.macscustomtiedowns.com/product/m10-threaded-stud/VersaTie-Fittings
http://www.macscustomtiedowns.com/p...d-edge-series1-versatie-8-foot/VersaTie-Track