How does that work? I really don't understand Scuznet, and not sure I understand this card.
I've been following those developments since day one, but haven't been around much to see that there was a PowerBook fork in the development. That's fabulous!
As I understand it, Scuznet emulates the function of any given external SCSI->EtherNet box, of which there were several. Apparently it's magic bits are tiny enough for internal use on any Mac and now it seems they're suitable for use as on an internal modem replacement for PowerBooks.
Dunno if the 68K Duo's support multiple SCSI IDs on the internal bus, but have no solid reason to doubt so. The 2300c has both SCSI and IDE buses, so it will definitely be able to support a Scuznet modem replacement.
As for the seemingly odd placement of the power-on button, clearances for internal components, hinges etc would seem to be the reason for it. I wouldn't print an adapter for the existing power board. I'd suggest doing a new PCB with provisions for momentary switch, soldertail S-Video connector and a connector for internal flex cable adaptation. Printing a support/close off the square opening structure to be melt point or bolt mounted to the new PCB would be the ticket I'd think.
Meanwhile, wait to see what happens in the other thread, You and saybur have me thinking that an RJ45 medusa cable breaking ADB out on the two unused pairs of the connector might be perfect for the Duos and PB150.