You’ll need: 1.3 1/2″ PVC pipe (or equivalent length) 2.6″ x 6″ plywood or other rigid wood 3.1″ x 1″ ply wood or other stiff, solid wood for the roof 4.1/4″ pipe (3/4″) for the ducting (optional) 5.1×6 sheet of 1/8″ ply (or similar) for the bottom 6.2″ x 2″ wood for backing up the…