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The base frame consists of a cuboid made of aluminium extrusions, I-type, 20x20mm, screwed together into a shape that is 40cm wide, 30cm deep and 20cm tall.
For the metrically impaired: the extrusions are about 0.79" squared, the cuboid is roughly 15.75" wide, 11.81" (i.e. an injured foot) deep, and 7.9" tall.
The vertical struts have been threaded on each end to fit M5 screws (i.e. 5mm diameter). Both to later mount the top and plates, as well as rubber feet on the bottom.
The extrusions were scavanged from the local hacker space, 2m long pieces cut to length with a little hand saw, the threads were also made with a hand tool. Precision was rather so-so.
Sheet metal was ordered, pre-cut from local company Aduis. It is galvanized steel, about 0.6mm thick (circa 23.6mil). When I picked the galvanized steel, I had something with big zinc splodges in mind with more of a trash can kind of look, but the quality of the material is actually quite good.
The rubber feet were bought at a local hardware store. Those are basically a bunch of thick, rubber coasters for furniture with a way-too-tiny hole in the middle that I forced some M5 screws through.
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