RaleighSport - No, I haven't gotten to ride this one. It was built for someone else. The next bike will be a cyclocross-ish bike for myself. I will probably have plenty of questions for you guys.

Andrew R Stewart - I think I might close it up like you mentioned for the next frame. I think I have enough spare extrusion to extend the vertical piece in the front and replace the top piece with a 4' piece like the base. I'll double the extrusion to stiffen it once I have the money for that.

MassiveD - How long would I have to wait before the fillets are cured enough to start wrapping with fiberglass? I'm using slow hardener which cures in 10-15 hours. My workspace is probably around 80F most of the time. Wait about 8 hours? I feel like this would be a delicate procedure using glass roving. It seems that I would be cutting into the fillets if I wanted to wrap tightly enough. If I were using a fabric overlaid on the joints I would be a lot more comfortable laying it up before the fillets are completely cured. Maybe I'm misunderstanding something.

I got the bamboo from Bamboo World. I ordered 1" diameter for the rear triangle and 1.5" for the front triangle. There's a decent amount of variation between poles and even throughout a single pole. They don't do small orders unfortunately. They only sell in bundles of 8' poles.