You are correct about the "investigating the feasibility" stage. Although there have been several pictures around of bamboo cycles from the 1890s.

I guess in our current culture, steel or aluminum tubing is so commonplace and so easy to procure, we almost take them somewhat for granted. Nice to know that there are some experimenters around who are working with different materials. In this case, very sustainable materials like bamboo.

Of course, you do need steel bits for the bottom bracket and the head tube, etc..

What I admire about these is that they have the look of very elegant furniture. By this I mean it's like looking at a really nice wood table when all you've ever been exposed to is press-board and veneers.
i especially like the look of ChiapasFixed's bike because the way he has mixed the epoxy and the rope makes it look like the bamboo is lashed. Very cool!