At first I would Thank You for this mod.
I use some of the large turbines.
I had the Idea to do forestry below them. You are able to place building (like farms or offices) in their radius, but you are unable to plant trees. The problem could be, that the "placement radius" doesnt block building but ground-changing designation (forestry, mining).
I dont know if or how possible it would be to enable the usage of these huge spaces for forestry. Im not so deep into modding, but I had the idea, that their could be a turbine which has clipping (no placement radius) enable, so you dont block the ground below the animated blades.
Its a great mod.
Yours sincerely,
Snoki