This is the fort I (Chris) built the kids over President’s Day Weekend. It took two-four hour days of shoveling and packing the 12 inch deep snow. It has an j-shaped entrance tunnel, three rooms that were 3 feet by 8 feet each, a turret with crenelations and merlons. (I had to look that up) I eventually added two small stoarge areas and an air hole. The roof varies from 30 to 40 inches in height.
Augie and I spent a 24° F night in the fort. It worked out pretty well, we stayed dry and warm. He slept soundly the entire night. I of course worried about cave-ins, coyotes, and having to help someone with a subzero pee break, so I tossed and turned a bit.
The next day, some kids and their parents were walking by as I was doing some interior touch-up work. Augie invited them in. Before I knew it- we had 10 kids, myself, and two visiting parents all inside. We were comfortable but a little cramped. Thats when I decided to add the turret and the third bedroom, you really never know when you may have unexpected company and need the extra space.