Looks like your Bamboo bike is coming along nicely. I suppose the seatpost would be held from slipping down or splitting the top of the bamboo seat tube by using a simple bolt-on clamp ... just as is already the norm on modern CF, Aluminum, TI and even lugless steel framesets.

I was recently discussing with a friend just how far one might go with a completely home built bike... say in a post-apocalyptic world scenario - where fancy industrial milling machines were long silenced, and thin walled steel tubing would be no longer available to simply order over an Internet which would no longer exist.

An image from last year's Copake Bicycle Auctions which I recently came across got me thinking about just what could be done with bicycle wheels, as well. The wooden spokes and rims if this early Safety bike are surely quite strong, and likely rather light weight too. And, I suspect the spokes could be further thinned if additional spokes on each wheel were used. Such a wheel might be fairly easy to construct. No more difficult then setting the rails of the backrest on an 18th century Windsor chair or perhaps a bentwood rocking chair would a better example of the ability of simple forms to hold together well even when under the stresses of movement. I love Amish and Shaker furniture already... I'm probably about ready to take another step backward toward earlier 19th century forms of bike technology too.