I built an igloo style oven for my brother over the summer that is 4' round, it's an outside oven that works great. I just purchased a new house that has a center fireplace and chimney. The fireplace is in a niche and is not desireable and smokes because they bent the throat too much. The back of it backs up to the kitchen so I thought I would take it out and put a little brick oven in the kitchen instead. I am a mason by trade and decided to build an arch type oven. I am limited on width but not depth. Does anybody have any measurement considerations on a small oven? I have about 29" to work with. Thanks in advance.