This is a really creative way to build a foundation upon which to place the yurt. Your wood sectioned flooring in subsequent photos is very attractive! What do you do to prevent rodents from finding their way into the straw bales and setting up their community? I realize you tarp and tyvek wrapped it, but is that enough?
I'm hoping the tarp & tyvek will be enough. Two cats live in the yurt & are on the prowl outside during the day--not at night yet though for fear of the coyote choir, but will be once I make a dog-safe hiding box & have a bit more of a fence around. The one night they were out there was a bit of carnage in the morning...
This summer's setup (~3 months) with the wood platform sections just on cinderblocks worked decently, except for draftiness between section seam imperfections (and a mis-sized section that let the cats come & go as they pleased). There were a number of dead animals underneath when we moved. A rodent did manage to sneak in the yurt & created a cache of seeds/dog food/cat food in some stored blanket materials--the platform lip/canvas seal wasn't as complete as it is now however. So the rodent problem isn't unique to the straw...
My very first setup (temporary, just for testing purposes) was also on straw bales, but with OSB sheets for flooring & nothing enclosing the straw. I took the yurt down mid-spring that year & the platform got rained on a bit. The OSB was alright but most of the straw bales were at least partially moldy. In taking everything apart, I saw one rodent, a snake, and lots of worms--the old asphalt pad I'd setup on apparently was worm-permeable. Based on that I don't think the straw, especially enclosed, will be all that attractive to rodents.
Also note, I'm staying at a horse boarding facility with a barn, a hay shed, & lots of tarped hay, plus various feeders around with loose hay. My guess is rodents would go for the hay (lots of seed & flower heads) instead of the simple straw (minimal wheat heads & really dry stems).
