Did you do your homework grasshopper? lol I hope so. My best advice for you is to >fully understand< I repeat..>fully understand< how to build the yurt, before you attempt to build the yurt, or you'll be wasting your time, your money, and then be asking the wunderkids at Home Depot when the next yurt build class is scheduled.
Just one build detail of big s pot full, is: For calculating wall length, if your lath hole centers are on 12", and the yurt wall is expanded such that your laths form squares in shape, not diamonds, the horizontal distance between any two adjacent lath centers is 16.97". a2 x b2 =c2. Savvy?
If you want a 20' d yurt, and the lath centers are 16.97" apart as detailed above, 3.14 x 20' will give the overall wall length-which includes the door width. Divide that by 16.97 and that will give the number of crosses that the rafters sit upon, including the 2 or three atop the door frame. Round up or down to get a whole number.
That number will also be the number of rafters if you have a rafter sitting on each cross. That also tells you the number of rafter 'slots' in your yurt ring if you use the kaminari plan. You can use that number to do the math on the ring, without having them show the ring and say 'do this that and the other'. You'll also know the exact diameter of your platform, not including overhang.
BTW, you can lay out the yurt in cross section on the garage floor and make a master rafter fit the specific ring height you've chosen for the yurt. Just lay your 1x4 in place and mark it. Voila! Piece of cake, eh? lol
Etc. Have fun. I've been a carpenter since 1973, and even so, I read and re read the kaminari plan until I fully understood it before proceeding. We're here to help. Good reading and good luck.