Connecting bamboo rafters to center ring

[Pucks_poppy]

Hey, any thoughts on methods for connecting bamboo rafters to the

center ring

? My

center ring

is made of 3 layered octagons, like the Simply Differently design. Considering that bamboo is hollow and not a uniform shape or diameter, I'm puzzling over the most secure (and still removable) method for connecting these parts. Thoughts?
I'm including the photo from the Simply Differently site, in case y'all aren't familiar with it.

[Bob Rowlands]

My only comment is trad style round rafters on nomadic yurts go into holes burned or bored into the ring. How well this would work with bamboo rafters beats the heck out of me. That is one MASSIVE yurt ring btw. Please be very careful with how you engineer your yurt roof system.