Greetings, I have a Brinkmann smoke and grill unit which uses charcoal. I would like to change it to using gas, as we have a Brinkman gas cooker, which looks like it would work nicely underneath. Is there a way to do this? If so, do I have to have a rack with lava rock on it(what is the purpose of the lava rock anyhow?) and do I need a different type of burner for the gas cooker? I do want to use the wood chips for smoking, so I am assuming I would need some kind of container for those above the gas burner. I am hoping to try smoking a small turkey for Thanksgiving, so am anxious to get this modified if I can. Thank you!!