Curious...are you going to use a US-spec 2.3 to start with, or did you decide on a different motor? Didn't they come as 2.5-16s in Europe? In any event, you'll be dropping the compression, I presume; will you drop it a bunch and plan on heavy boost, or keep compression near stock and limit the boost?
I'm sure a bunch of us are eagerly awaiting this endeavor...sounds like a cheap vicarious thrill for us, and if you can pull it all together for reasonable dollars then, heck, maybe I'll try it?
Best of luck, and let us all know if we can help you find anything!
(formerly) '83 Suzuki XN85 Turbo (nuthin' quite like a big 'ole dose of Boost!)