So I have been really wanting to build some geodetic domes to make light pendents and mostly for the heck of it. Now i got a few and cant bring my self to drill them for lights. Pretty easy build 15 equilateral triangles cut on the chop saw. Then I put a 20 degree bevel on the bench sander. It technically should be 18 degree bevel, but I found that the 20 made it nice and tight on the outside of the joints. Inside had a little gappage just filled it with glue. Assembled with glue, tape and some time.