In response, yes ICE are very good in my experience answering a technical question on the B2 very quickly, I can't speak for the rest.
Performer I have looked at, but can't remember if they do framesets, will have another look as I really want to take this as a build project myself.
The other thing I've thought about is a bachetta carbon, but I don't really like their handlebars, or the M5 High racer, carbon again looking at a frameset if they do one.
Just sent a more technical e-mail to Schlitter with a list of what I have, what I'm thinking of adding to the list and some other questions. We'll see what response that gets. Maybe they didn't think I was serious before?