Flattening the heated PVC. Unrolling the PVC pipe and getting it flat is covered in the first minute of the video, while the rest of the run time is dedicated to building the tool box.

Acquire an empty 5-gallon drywall bucket, 1- and 4-inch-diameter PVC pipe, a 4-inch flat PVC end cap, pipe fittings to reduce the 4-inch diameter down to 1 inch, a 1-inch tee fitting, PVC solvent ...

I finally just drew up a plan, bought a bunch of 1/2" PVC pipe and fittings, and put this together.

What You'll Need 24m of 50mm (NPS 2) PVC pipe, and 8x 50mm elbows, 7m of 50 x 150mm lumber and 4m of 50 x 100mm lumber; three 100mm carriage bolts (with nuts and washers); wood screws 60-75mm long.