To calculate everything regarding all wood parts and canvas follow the link below- where you can also explore all manner of other structures;
http://simplydifferently.org/Yurt_Notes?page=1#How to Calc
We buy canvas from Mitco in Glasgow, UK. Its fire- proof, rot- proof and waterproofed, and we have had it outside in UK conditions over 10 yrs before it needed replacing, even next to trees which is not ideal. (I have not found local suppliers here in Sweden) Some people are now going for up to 30% synthetics in their canvas, as it dries faster, but I'm up for keeping these structures purely plant based when possible! We go for a 12 oz canvas, much heavier and it's a nightmare to dry. I used to sew the canvas with a simple hand powered Singer sewing machine, picked up for £5 at a car boot sale, and sewed canvas for up to 6m gers single handedly using a tarp and a slope to be able to pull the material through easily. Having sewn many km of seams over the years I got adept at sewing a double seam (like on the side of your jeans) folding with 2 fingers and a thumb whilst winding & guiding with the other hand. For these larger gers we borrowed an industrial electric version of the same; either will do...
I also personally value the silhouetted architecture too much to insulate with felt, etc, which can make the interior so dark. A good woodstove saw me through 2 UK winters no problem without insulation, though I'm also used to living a little simple. Up here we will use the structures only half the year, taking them down in winter, but if you do insulate it's important to consider breathability. I've seen people with plastic bubble wrap insulation and plasticized canvas rotting out their structures really fast!
Here's a slideshow of making two 9m gers in less than 2 weeks. We choose high quality pine for the roof beams simply as they we so long ( 4.5m!) The walls are oak. We also use metal fixings either end of the roof poles to ensure rigidity. Overall these yurts cost around 40,000 SEK each, not a bad investment since buying a ger/ yurt this size can set you back 120,000 - 200,000 SEK.