Re: the ADB signal . . .

-- quite understandable since the SE/30 has no use for it. Then I searched for a point in the mobo directly connected to VIA2's PB2, and I found it. The only remaining thing would be taking it outside -- pin 5 of the external floppy connector is unused and not connected, so it seems quite suitable for the task.

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I was reading your post in 68k Soft/Hard 68k Power and ATX conversions . . . and remembered something interesting:

The PB100 somehow has the ADB signal present on its Power Connector! I remember thinking how cool that might be for creating a rudimentary single plug Docking Station for BabyPB. At the time I was using it at my computer workstation (ergonomically correct) in the big closet I'd built next to the dining room table in our NYC co-op apartment.

Since the standard 100 series wall wart is a two is a simple two contact power plug, there must be a way to simply pipe the ADB signal to one or the other of these wires to get it into you external box. Such a circuit inside the SE/30 would prune back the cable monster a bit.

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On another note: check out the new developments in Switching Mac PSU's @$$tBits + ATX = ?????

I may not have been reading your OP correctly, but I've sourced a 250W ITX PSU that fits inside the IIsi PSU's sheet metal. IIRC, this is about the same size as your SE/30's PSU if not exactly the same PSU? Maybe you can stuff your proposed external box inside your SE/30?