I'm going to build an outdoor island for a built-in propane gas grill and a Big Green Egg. Size will be approximately 10'x3'. I'm planning on building it with 18 ga. exterior metal studs and durarock, with a tile top and stucco exterior. It will sit on my patio, which is 5" concrete reinforced with WWF and rebar. I plan on putting Trex or similar on the concrete and the metal tracks on the Trex. I stubbed up electrical and propane before the slab was poured. The electrical will be a dedicated 20A circuit, and I know it will have to be GFCI. There will be no water at the island. I know I need at least 20 sq. in. of vent down low because of the propane. I haven't found a local source for the metal studs, and BORG only carries 25 ga. interior studs. I would appreciate hearing any experiences with this type of project and any advice on materials.