Pizza oven and bar are done so now I'm working on the kitchen. It's metal stud with cement board construction. I have granite for the counter top and was planning on using plywood under it as I did with the bar. I'm concerned about the exposed edge of the plywood under the granite near the grill. Can I cover that edge with the cement board that will cover part of the interior of the enclosure or is that enough separation? Can I use cement board under the granite instead of plywood? That doesn't seem as rigid. I should point out there isn't an insulated jacket for the grill.