Thanks for your contribution.
As some of the others have indicated.
- is it necessary for the design to work to have a piston at the top?
- isn’t it possible to make it airtight enough that it would only need to be refilled every now and then? (Perhaps 5 years intervals, When you service the turbine anyway)
- couldn’t you design it such that the you don’t have to adjust the pressure when it’s cold and warm?
I think you can afford to transfer the loads from the intermediate guy cables to the tower section directly. The cables along the tower seems unnecessary.