I will be building an outside kitchen that will be under cover. I am torn between using metal studs to frame it out with, then applying backerboard to it for stucco or use concrete blocks to frame it and then apply stucco. If I use metal studs the job will go much faster. I will be using a Afresco build-in grill and a side burner. So, everything has to be non-combustible. I would appreciate some advise on this project.