I just want to say good luck marmistrz, I have no idea if this can be done or not but there is a chance that you may very well be a genius and prove all the doubters wrong.
It makes more sense to me write symbian emulator layer. I don't get that idea of porting whole OS'es. Also it's same with Meego. Developers behind Meego N900CE, should spend their time on things we don't have on maemo. I mean we have working kernel, and APIs to access Nokia closed things, why can't Meego run on top of Maemo?