How to structure turbine rotor's domain
 

Dear members,

I have a 3 blade wind turbine rotor drawn here along with it's rotating domain and outer domain, I have sliced the outer domain and structured it such that on mesh it became a good hex mesh.
Now on solving this the Y+ for the blade walls was found too high and I need to decrease it. of course inflation isn't an option as it spoils the whole outer hex domain and worsens the quality insanely .

I'm looking to make the inner domain structured now(see the attached), any clue how to slice that so it has edges I can give bias to in meshing ?

(note that the turbine blades and the nose are no longer bodies as I subtracted them from the inner domain and chose not to preserve tool bodies as they're solids not flow)