I got the HDI-30 socket this morning and after only four hours of soldering and double checking the connections it worked powered off my Classic's ADB lead!!!

See below, not pretty but functional.

http://web.onetel.com/~colingjones/mod1.jpg

I soon had the Plus running System 6.0.8 (with no clipboard, keyboard or mouse control panel and 2K spare on the floppy) sharing applications like Quark and Photoshop from my Classis over ETHERNET!

I'm now working on a disk to give the Plus an IP address.