You really need to bite the bullet and think reduction. I have about 20 of those big plastic containers full of stuff, and I have manifested every one and still have trouble finding things, mostly cuz people just don't put stuff away proper. I've a bunch of gorilla racks that I use to stow the containers and other items. Usually, everything comes off the shelves and ends up on the floor in the garage; lid open, contents disarrayed and/or scattered around. So I guess my advice is for both of us.

I reckon my only option is gonna be to build a warehouse, rig up a robotics inventory control system, and just use my computer to call up whetever it is I am looking for. I was at a Honeywell lab once and was amazed at how their robotic inventory retrieval system worked, but man did it take up a lot of space!