use "stalls" piece of plywood on each side, that goes from bottom up about 4 feet, for "short stuff" to lean against, then run some 2x4's high up, across sides , for longer stuff. normally put a bottom in, to raise everything up off the floor. to make it easier to clean things up (sweep / mop) and help deal with rodents, and the ever eluding object that falls onto ground and ends up rolling under something. normally just let everything lean up against sides, or back of the stall. (back of stall = side of building) some times putting a piece of lumber (plywood or other) if i need to deal with not damaging wall of building.
the scrap lumber from various projects, ends up getting saved up. and then slapped together to form, shelves in some stalls for various items. call it a "pack rat setup" but over years, that chunk of metal, or lumber, or pipe, or what not has found its use.
try my best to stay away from any sort of drawers, and keep shelving down to min. and try best to hang tools from nails / screws, to leaning stuff up. so i am not having to move a bunch of stuff, to find what ever i am looking for.