Perhaps not close enough.

- look up "infrasound" and "undercutting minimum distances", better use something else than Google for this.

- also check the requirements for the base materials: concrete, aluminium, fiber-reinforced plastic. Calculate the energy requirements for producing them.

- familiarize yourself with the space requirements (~ two acres of highly compacted soil, not including access roads)

- duration and disposal

- soil dehydration, other environment impact issues

- ... and as always of course, base load capability and storability