After spending several days drooling over this image:
I've pulled out my old Apple II+ logic boards and decided to give it a whirl.
The first step was to repopulate the boards with the RAM and IC's that I had scavenged from them over the years. Turns out I'm short two 16kilobit DRAM chips and one 74LS151. I also need to replace a damaged 74LS257 (broken pin).
I'm pretty sure that I have some decent standoff's laying around that I can use to keep the boards uniform. I'll have to dig around and see if I can find them. If not, I'll have to buy some. I want to have at least 2.5" inches of airflow between the boards.
What I'd really like to do, is get a big honking server case to put these babies in. After all, no one really needs to know that this "supercomputer" is nothing but a bunch of Apple II+ boards networked together.
I'm really liking this idea. I salute you, Mr. Mahon.