not the most effecent design and not cheap is it legit
it is not most EU/t per wind mill efficient but it is very space efficient (used low space for tons of wind mills) and it is legit.
Built on version 1.8.1/IC 1.337b
Edit: 32 wind mills per tower is a good number.
64 wind mills per tower is also good, if you have even more limited space.