> Are there actually transhumanists who actually work on building transhuman stuff?

More than you might guess. There's a lot of participation within the do-it-yourself biohacking scene. Also, RepRap and other open source hardware projects tend to attract transhumanist talent. I don't mean to sound too biased but you should check out that IRC channel I mentioned.

A while back I interviewed with a startup doing transhumany things that was full of on-the-ground transhumanists and they were all quite serious about it. They're out there.