I seem to have gotten several requests for plans....I sort of did this on the fly (not that it was a quick build)...HERE IS AN AWESOME PRIMER
...Instructables is a fantastic site in general, and this particular instructable will give you some ideas. NOTE: I did not use cedar wood \ or curve the top! Just omit the top and the curved supports and add planks and casters to the bottom. The gas plumbing was done with black iron pipe and I just drilled holes where the burners sat.
If I could do this again, I would use unistrut, superstrut, etc. for the actual rails that the vessels/flame touch.