I find this somewhat hard to believe myself, but the first prototype of the Übersquirrel is up and running. The wires are a mess, it's still missing a bunch of parts, but OMG I have actually built a working computer!
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As it stands, it's a WDC65c02 with 1.8 MHz, 32 kb RAM, 8 kb ROM (soon to be expanded to 16 kb), and a MC6850 for the serial port running at 28.800 baud (thanks, Mario!). I'll be adding the second ROM block and a VIA 65c22, do some more work on the OS, and then figure out how to wire wrap the final version.
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However, first and foremost: Thanks so much to everybody here in the forum who has been such great help the last few months and made this moment possible. I couldn't have done it without you guys. You're a great group of people.
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(Oh, and the cat -- black blob on the right -- helped, too, I guess, though my heart stopped briefly yesterday when she almost walked over the breadboard.)
And now I really, really have to take my very big smile to bed.