Scooba,
The stackhouse is 60" square. I hunt also with my 13 year old daughter and comfort is key to havong her stay out there. We have a Brickhouse TSC and I'M veryhappy with it as it offers enough room for both of us. I believe the Brickhouse is 60" also with a slightly different design. It remains 60" all the way to the roof section offering a lot of room. . We also hunt with the camp style chairs when we gun hunt. The key to being able to maneuver in the blind for us was to purchase the camp chairs that do not have arms.
Have fun

By the way. For bow hunting with 1 person hunting it will be fine. If you are looking for 2 people with bowhunting you may want to look at the Ameristep bighouse. I've been in one and its huge. Enough room for several gun hunters and at least 2 bowhunters