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Overall a very good design. Personally I'd build it from steel, but then I have a full functioning machine shop and started my adult life as a machinist & tool maker. If you have access to a plasma or water jet I would use one of them to cut the sides. If not, then using a milling machine and having radii in the corners of the triangle cut outs is not a bad thing and in fact makes the structure stronger. As you point out steel is quite a bit less expensive.I would like to see the dimensions made darker so they are easier to see as the printing is quite light. CAD drawings would be even better. I use Draft Sight a free easy to use 2D drafting software that is compatible with AutoCAD.BTW, ditto on Horror Freight equipment.Your instructions are excellent. 4.5 out of 5 stars.
Just be careful not to overheat the PVC as it will give off very toxic fumes, especially if you accidentally set it on fire. Said fumes are extremely toxic and will cause serious lung damage.
Stain remover for molybdenum disulfide grease stains in clothes. It will remove the stain and then the WD is much easier to get out of the clothes.