Nice work there!
I'm 4 days into my build. Carbon wrapping completed. Sanding & filing now.
I still haven't decided on a finish. I like the look of your finish. Can you specify what you used and how you prep'd the bamboo outer surface?Had been considering a standard marine spar polyU...but worried it will flake off the bamboo surface due to poor adhesion.

Details on my progress here:
http://www.pbase.com/d30/bamboobike&page=1