I figured out the trigonometry to calculate most of the stuff I needed to know with the interactions between rail sizes. Enough to rule out a big chunk of them. There are some potential clearance issues I didn't math out, but I'm taking the remaining combinations (only like 10 passed the math test) and mocking them up in CAD. Any clearance issues should be obvious there. And in fact, the only combination that looks like it MIGHT work is 20mm unit vertical rails and 30mm unit horizontal. There MIGHT not be enough space for the acrylic sheet then. I will look a little further later, but I'm kinda disappointed that it seems like it may not work exactly how I want. Am I going to wind up going to the boring fully-boxed design?

In other news, I started the process of joining a makerspace. I have the keyfob that will eventually let me in, but I have to attend an orientation first (which is scheduled for early next month) and then I have to get training on the machines that interest me before I can use them. I want to eventually start machining my own aluminum parts. Being able to make custom parts out of something that isn't plastic seems awesome. The makerspace has a forge, and I kinda want to see if I can make a custom build plate out of recycled aluminum cans that I melt down, cast, and then plane all myself. We'll see. That's a lot of work for little reward aside from satisfaction.

DigiKey had TMC2209s in stock for the first time in a LONG time. I immediately bought almost 1% of their stock. Probably overkill, but that's the last electronic component that had been hard to find.