Brian Lawson wrote:

The good stuff like that is called Dexion, although I see lots of
clones at the big stores now-a-days.

I will check into Dexion

And somebody mentioned Uni-strut. Way too expensive, especially if
you intend to use their assembly hardware. Although, with the proper
cap pieces slid on/in, it can be used in some cases as duct, but the
pre-punched stuff is really big bucks.

Point taken on Unistrut being way too expensive

My suggestion about the "key-hole" shelving was to use the good stuff,
rated for at least 300 pounds per shelf. The light -weight economy
stuff is great AS SHELVING if you already have something to fasten it
to, to keep it upright and steady plus an additional wood or
something as a "liner" to top those paper-thin shelves with.

Understand

Thanks!