Hello y’all. I have decided to take the plunge and build one of these ovens. I’m planning on building a custom base from cinder blocks and highlighting it, making it the cornerstone of my outdoor kitchen. The base will be rather large and reinforced on the interior with a block support system. The top will be cement board with a 2 3/4” concrete counter top. My thought is to use the oven form in the concrete counter top to form a “cutout” of where the oven will sit. I then plan on using calcium silica board, vermiculite and firebricks in that form to build up even with the concrete. Then build the oven on that surface. My question is, should I use high temp concrete on the counter top? My concern is the heat transfer from the bricks to the concrete and the concrete cracking, or worse. Thanks!