Oh, I see the other furniture units, and it's awesome that you can craft them in the mod, at least for the aesthetics. But those things are 2 blocks high, double the size of the chests/boxes/munitions crates.
Storage per block:
Chest/box: 49
Filing cabinet: 30
Fridge: 50
Safe: 60
Munitions box: 100
Dumpster: 30(?)
So the filing cabinet is actually worse on a per-block basis, the fridge is breakeven, the safe a bit bigger, and the dumpster is probably terrible. I guess I could stack fridges or safes on their sides and see if that works, but now I have to redesign my base to fit them lmao
What would be cool, and maybe more in line with what you're after, would be high-capacity 1x1x1 cabinets of various kinds. The kitchen types are obvious, but I'm looking at all these mechanical, electrical, and automotive components and thinking, gee, IRL I would have some of those humongous chests with 348057348 little drawers in them for all the different items