We've been waiting for this to pop up since Steve spotted it. Him and I are both working on C110's ourselves.
We've watched S20's in parts going for upwards of 10k on Yahoo Japan, an S20 is not an option, if you could afford an S20 you'd be buying a GTR hehe
Parts for C10's seem to be a lot more common than the C110's, I see heaps on Yahoo and also heaps on websites etc.
Good luck with the project.