Interesting thread. For the others considering a wooden frame, heat was an issue for me. I have my keggles mounted on angle iron, but with the flame kicked up, the bars would get so hot on the wood frame where they attached I had some major charring. Even with the addition of wind/heat guards (stainless steel).
So I had to remove that piece and I took a page from Scubasteve's build and used Durock cement board in its' place.
I have made some other minor adjustments to the stand, and it works great. Hope this helps some.