Today, we finished cutting all the parts for our first dome and tried to put them together using orthodontics latex elastics.
How we put the elastics:
When we assemble them:
After that, we decided that the elastics would stay on better if we cutted nocks at the peaks of each triangle.
We also came to the conclusion that the strips would be on the outside rather than inside because, as cardboard is a steady material, it doesn't stay in place is the strips are inside and we're afraid the elastics will just suddenly pop out.
We'll probably paint the ball so that its surface is uniform.