Step 1: PVC for You and Me

Rather than messing with a hammer and nails, it's easier to frame your box with good old PVC pipe. Home Depot has every flavor of PVC known to man. We used 3/4-inch-diameter tubing for our smallish box. Get the stronger, one-inch-diameter PVC if you want to make your box big enough to stand in. PVC is super-easy to cut with a wood saw, or you can buy it precut; either way, you need eight two-foot lengths of pipe, eight T-joints, and four two-inch shims to connect the T-joints.

Sixteen feet of PVC pipe and eight T-joints, all chopped up juuuuuust right.