I discovered at this point I had messed up on the opening for the grill. I had sketched my layout on the back of the circuit breaker panel and determined I needed a 34.5"wide opening to fit the grill into place. When I did my layout on the back wall, for some reason my brain told me 33.5" so when I went to install the grill, it fit, but I didn't have room for the cement backer board I'm wrapping the whole structure in.. Argghh!! Only took a few minutes to fix, but what a PITA!