Yes I did. And yes it is two plywood rings with spacers. You have a good eye for detail. If you have an interest, the construction details of the yurt ring, and in fact my entire yurt, is online. Google:
Clan Yama Kaminari/ how to build a Mongolian yurt.
Scroll down the main page a short way and click on 'yurt construction' on the left center of the page. Then, scroll well down into the construction procedure and you'll see that ring in detail. Good solid yurt. BTW be sure you anchor your yurt to the platform, or the ground. Or both.
I did modify the spacer block detail. I didn't use the 3/4 board spacers. I made all the spacer blocks on mine from a 4x4x8', ripped to height and thickness, and cut to angle with a chop saw. I have a 35 rafter ring. For angles, I layed out the rafter spacing right on one of the plywood rings, and pulled the cut angles off that. Also, instead of 2.5" spacer depth, I went with 3.5" for extra gluing surface and wider screw spacing.
During assembly, I glued the blocks with construction adhesive, layed to penciled lines, and pin nailed in place. Drilled 1/8th" pilot holes through the plywood and into the spacer, and fastened with three, plated 3" drywall screws. That mother is solid lemme tell ya.
. That ring should stand up to any snow load we get here.