Hey guys... So the thing is Im designing a surround with a built in grill with a seperate door underneath for storage. It is going to be built out of Belgard's Windsor stone 8x12x4. There is going to be a layer of block between the bottom of the grill and the storage door. How do I support those blocks that go across a 28" opening. Wasnt sure if I should use a piece of metal or what? Much needed help. Thanks a bunch!