Mark, I'm sure I've looked at about all the CS20 build logs and threads, I know yours was among them.
Trying to get some idea of the material cost I added up everything on the B&B order page, added in what I thought was a generous amount for stuff like dimensional lumber, lights, engine, etc. To me it seemed a reasonable amount for quality materials. Plus, if you're doing your own build it doesn't need to come out of your paocket all at one time.