Here I made most of my storage shelves out of those angle iron bed rails and reclaimed 3/4" plywood. I cut and welded mine but they probably can be bolted to together but require cross bracing as they would rack without it.
Welding will be at fix distance between shelves so some intermediate shelve might be add that just bolted in place so their distance can change by drilling new holes.
My shelving is on a 2' x 4' format with the height around 6'.
The only problem now is getting more rails as the scrapers are snatching up anything metal to sell.
