Thanks guys for the compliments.
Regarding the stonework. The model itself is built from 1/4 inch plywood. It is covered in sheets of textured stone that I make myself. The cornerstones are cut in and epoxy putty applied, sculpted then carved after it has cured .
The stone sheathing is from a master I sculpted.
I made a silicone mould of it.
In that mould I trowel in ready mixed ceramic wall tile adhesive reinforced with drywall mesh tape.
When dry remove ,cut and paste.
The sheathing is flexible for round towers as well.