Well here it is. As I said in the other post I built it in modular fashion in my garage. I used the bronze colored torx head screws (they are about the only thing that pressure treated wood won't eat away). The 3-1/8" for all dimension lumber and the 2-1/2" for all else. The first pic is of my youngest son working on the base (2x6 and 3/4" green treated).
The base up on the sawhorses. Note the 3-1/2" lip around the three sides of the hole for the 2x4 walls.
The end walls going up.
Note the 22-1/2 degree slope on the walls (this gives a 1 in five pitch if I remember correctly)
The box installed in the hole to fit the walls on.
The vent holes being framed at this point.
The base up on the sawhorses. Note the 3-1/2" lip around the three sides of the hole for the 2x4 walls.
The end walls going up.
Note the 22-1/2 degree slope on the walls (this gives a 1 in five pitch if I remember correctly)
The box installed in the hole to fit the walls on.
The vent holes being framed at this point.