I had built my structure with the same material, and it worked great. One of the real benefits with this contruction is that you can change things as you work the system out. I have already reduced the space between my burners and lowered them below the brew pot/mash tun.
A couple of things to note with this design:
Be careful the first few times you fire this up, since that material is Zinc coated, this isn't the best thing to breathe in as it "cooks-off".
There will be a far amount of heat in the strut from your burner, so be careful with your mash tun, it might melt.
Do your caster lock? lifting a keg of material on this, and trying to center on the burner, might put some load on the base so that it moves unexpectedly.
Take care, and good luck.
-Greg





