That's about the same size I built mine, except I went 5 feet high as well as wide.It's a 8 ft long 5 ft wide and 4 ft tall, The walls are 3/4 birch. I did go 5 wide because that's what it takes for a queen mattress. I've never camped in a teardrop so I was worried about the size inside with 2 people and a dog.