Hi Red
it seems a really good job, indeed :-)
I've just discovered, that even a PowerTower4000, isn't enough for a highly expanded 4000.
I'm trying to do some mods on it (from the cooling POV).
The only suggestion that i could give is:
why don't design it , with in mind a tower backpane? The Ateo style, like yours, even if cheaper, has less Zorro slot on it.
Otherwise, if you have in mind to use it with the Prom, so . . .welldone :-)
Ciao