Cran,
There were some at the PFA Rally two years ago; I'm sure there will be again. Look out for me; I'll likely as not be staring at them on Friday.
If you do a search, there was a thread here way back comparing the R22 and Rotorway Exec, with some good stuff on it.
I know a couple of guys who built one; they're both engineers but said it was a huge amount of work and they wouldn't do it again. They also said it needs about two hours of maintenance for every hour you fly it; not sure why.
Nice looking little helo though.