Have you checked this guy out? I stopped by his shop in Riverside a couple of weeks ago and he was building a bigger version of what you were looking for. He's not far from you and may have some ideas you can use.
Disclainmer: I have zero knowledge of this guy, his quality of work or his business dealings. I get nothing out of this ~ just thought I'd pass some info along to possibly help.
http://www.fatboyshardcorebbqs.com/