I might get to the material warehouse in Burbank and get some angle iron. What sizes are comon?

1/2" x 1/2" to 3" x 3" is pretty common to find in 3/16" (0.188)

Check out www.ryersontull.com

They're one of (if not the) defacto supplier for the industry. It's a great resource for what's available and even some property data if you need it.

check out www.onlinemetals.com