re: Double decker tool box…

Eric there isn’t too much to it. It’s the top of my assembly table. I just routed in dadoes and installed t-track. Honestly, it can be a pain. I do use it somewhat often, but the table top isn’t very thick, so some of the screws have stripped out causing the track to lift. I’ve had to go back and repair it a couple times. One section I ended up gluing down. At the ends of each track, I used a forstner to create pockets to allow track devices to be put on the track. 

I actually had this setup on my workbench for a while and removed it and backfilled the dadoes with wood strips. Not a good idea for a workbench, especially with hand tools. Fine for an assembly bench if you make sure the tracks are below the table top just a tad.