Yurt platform

[dramatic]

Hello, could you please let me know what you think of my plan for the platform ? Going from bottom to top:

1. Octagon thick frame slightly elevated above the ground (with pillars)
2. Breathable membrane sheet covering the entire octagon (and holds the

insulation

from falling)
3. Floor joists
4. Mineral wool

insulation

faced up between floor joists
5. 12mm OSB layer
6. T&G pine hardwood floor (2cm thick)

My questions are
1. Putting hardwood floor over the OSB - Is it okay or am I better leaving out the OSB and attaching the hardwood floor directly to the floor joists ?
2. Should I maybe put the OSB layer instead of layer #2 - the breathable membrane ? So that way the OSB is under the floor joists and holding the insulation ?
3. Are rodents just going to rip through the Tyvek membrane and live inside my insulation ?
4. Do you see any other issues with my plan ?

Thank you !