Hey Allan,
I'm by no means a experiend brazer, but I decided to build myself some racks for the same reason you want to.

I used 4130 tubing from AS, some files, hacksaw, bender, etc... I used air/propane at first and it works okay, however I had to heat the joint for a long time and the flux would burn, complicating the brazing and clean up. I ''upgraded'' to air/MAPP recently and it works a bit better. I might try brazing with silver too for fun. Also, I'm using some very basic powdered borax flux mixed in water. Couldn't find anything else. Petepan1 you're in ON where do you get good paste flux for brass or silver?

Here is a pic of what I did last out of 1/4'' cromo. It mounts on the canti bosses with flimsly 2mm flat stock brazed in slots, and through the crown with a brazed bolt (I reamed 5/16'' tubing with a 1/4'' drill). It's got an integrated décaleur for a h-bar bag.