I've been organizing my reloading room/gunroom for the past few weeks and wanted to build some wall-mounted shelving that can support a lot of weight. My garage has warmed up to a balmy 30F so this weekend I starting cutting up some 3/4" x 3/4" x .065" steel tubing that costs $7 per 10ft length. It turned out to be a bigger project than I anticipated but it was well worth the effort. The frame shown is bolted to studs in the wall (24" oc) with sixteen 5/16" x 3" lag bolts. I wanted shelving that can support a lot of weight and I certainly have that. I need to get some 3/4" plywood from Home Depot or Lowes this week to finish it up. Don't be distracted by the press on the bench. I'm in the process of refurbishing it and it'll be bolted down soon enough. The top shelf gives me about 5" of vertical clearance which will be good for barrels or other low profile stuff that I don't need to access very often. The spacing between the other shelves is 10-3/4". I'll be cutting plywood to 72-3/4" x 13" for a 1" overhang at the front. I'll use a 2" hole saw to notch for the two center vertical posts (semi circle with a radius of 1") and a jig saw to notch the outer rear corners 1" x 1".