I heard somewhere that originally, Dryads were going to have tree-plots. Heres a simple concept that might help. Instead of trying to stick to the "rooms inside the tree" idea, rather have a tree-house effect. There could be like 6 to 10 branch platforms, some larger than others. The dryad could plan what to put on each platform. You could either have a ramp around the trunk going up or possibly have a ramp inside the tree going up.
Each platform would have an entrance from the ramp.
Silos on platforms could be more like large bags or sacks hangning from the platform to put stuff in. (make more sense than hoping the precariously balanced tower wouldn't fall) The higher the platform, the larger the silo that could be built there (don't want the baggies hitting the ground)
The individual rooms could use a bunch more textile and leather working crafting than current biped construction.
I can see draping silk tapestries waving in the wind between the branches of the trees. It would be beautiful to behold.
OH..... Don't try to make the tree house ramp usable by dragons.
REMEMBER: Dragons have Khutit form. It's kind of sad that it's not really ever used anymore.