Well, it's not done yet, but here is my 90% complete portable socket and wrench set:
All I need is the 1/2" SAE impact set, and I'll move the deep wells into a case with my impact wrench, then I'll make a molded tray for them, and remake the 1/4" and 3/8" trays. Total cost is about $400, as cheap as I could put together a complete quality set (I'm not wild about the wrenches, but they are better than what I had).
The trays are made through the process in the "cheap way to shadow a tool box" thread; I made a mold the same size as the drawers, laid the tools out, covered them with cloth, sprayed expanding foam over the cloth, pressed it down, waited for it to dry, pulled it out and painted it.
Some of the tools moved, though, and the cloth didn't let the foam expand as much as it needed to. I'm thinking about trying cling wrap instead of cloth, next time, and bracing the tools in place with wooden dowels, which would also prevent the foam from expanding too much and surrounding the tools, and maybe some clay to hold the dowels and form cutouts for the extensions and ratchets.