I welded up a metal frame and had some extra diamond plate laying around and put a locking latch on mine so I can secure my valuables laptop,gun, binocs etc..... I installed the quick release kit for the freezer/fridge so it pulls out easy. I coated the frame and case assembly with herculiner nothing slides around on top at all. I found a old "plastic "suitcase that fit on top of the drawer unit to fit all my off road equip in air compressor, straps chains, tire repair kit etc.... that way its all in 1 place , easy to offload and store .
Recently (almost) finished up my BJ74 storage unit.
Used Accuride slides that lock full open or closed, much nicer than the non-locking ones I used in my 70.
The front compartment has a sealed compartment that's divided in 3, for 2x6" drivers and a 10" sub. The open section has an 8 outlet Rigrunner for my 12V stuff (the 74 is 24V), and I'll eventually add a 3rd battery that'll live in there. Lots of room left for fluids or what have you.
As the fridge is shorter than the drawers, I ended up with a small area which I decided to turn into an electric board which has fuses, the 2nd battery for the fridge and lights and also a 500W inverter. It has a door on it for access and stops gear falling against it. This pic was before the 2nd battery was fitted in.
The area between the cargo barrier and the back of the drawer system..
In here I fitted a 50L water tank and also some shelves. The top shelf is for our swag and the bottom one is for our clothes bag etc. Under the bottom shelf is where I store car spare parts like belts and hoses etc.