Some progress was made today.
I had a bunch of magnets Ø10x2mm left over from another project. So I decided to use them to attach the panels
At the front, four magnets per fix point sandwich the stainless steel. This seems to work well and also gives me the planned 4mm distance between inner and outer housing at the front.

For the sides, I drilled 10mm Holes in the brass construction blocks.
The plan was, to epoxy the magnets in, but It turned out, that the magnets and the drilled holes create a light press fit.
So I just pressed them in with my vice.





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There are really better sources than a dxf from a random homemade build ?.
Let me know when you do your writeup, I'm interested.
As for delivery: as far as i remember delivery was about two weeks after order. I chose the fastest of the options 2/3/4 weeks.