I didnt want to drill my snap on cabs either, I got a sheet of 3mm allyminiyum and drilled and riveted the socket rails to it. It lifts out of the top of the box then, not that I ever do unless cleaning the box lol.

Use the plastic snap on spanner rails like at top of thread, with double sided tape holding 'em in drawer bottoms.

Screwdrivers socket extensions, plier sets etc I keep 'em in the drawers in the moulded snap on trays that they come with.

Don't transport rollcab or top box though it's too bloody big for that. It was a nightmare when I moved from Kent to Scotland, but as I had bought a lorry to move all our stuff I fitted a tail lift to it, twas easier than stripping the box drawer by drawer. I was shitting myself when it was going up on the tail lift tho !!

Cheers Dave