Cool, thanks!
Here's the build in progress:
First I made 35 triangles, then taped them together into 3 strips and a big and small triangle as shown in the top left. Then I taped the strips around the big triangle, as shown top right. Then I closed the strips into loops, and put the small triangle in, opposite the big one, as in the bottom left. I did that 4 more times, and taped them together into a loop, in the bottom right. All of that was interior tape, so finally I wrapped it on the outside, which truly strengthened it.
Then I continued, adding 15 more of the bottom left units.