I have never made one but if I intended to I would first find a source to purchase PVC or the material of my choice. The 2nd thing I would do would be to purchase a rack that is shipped disassembled to use as a template and incorporate any design changes that I deemed beneficial. If I could borrow racks that could be disassembled I would consider that as well. It would be quite easy to make a rack that screws together by doing as I just mentioned. It would be a whole different skill level to learn to use chemical welding or heat fusing. All you would really need is a small table saw and a drill.