Bob, my oven depth is 19" and change.
Scott, I have zero interest in 750. I'm not sure exactly how hot the stone got on the second highest rack, but I know it was at least 570, which I've found is as hot as I want. My stone did not block the vents when I put it on the oven floor, but it's possible the kiln shelf may be too big to use safely on the oven floor. Doesn't matter, though, because [see first sentence].
The pic below (from April 2 of this year) shows pretty much how I like NY style, regardless of whether it's "right." I don't know if that's my best upskirt pic, but I knew where to find that one. That pizza was baked in my MPO, I'm guessing in the neighborhood of 570 degrees. (I may have shared the temp in my MPO thread.) Any hotter and I get char, which I don't want. My tastes may change, but that's how I like it for now.