I am interested as well - terrestrial civil engineering, and associated carbon steel, concrete, and rebar materials, are dirt cheap in comparison to interplanetary aerospace engineering and their alloy or composite materials.

I'd have started my design like a Delta robot or inverted Stewart platform, with a trio of sturdy towers, a catchment ring in the middle, and cables running to large electric motors with massive heatsinks (saltwater?) that could position the ring anywhere in X/Y/Z between the towers. By choosing a site with a low central valley between three natural peaks, you could get a huge amount of volume and not need as high a tower, I hear there's a site over a Puerto Rican sinkhole that recently became available - though be gentle during disassembly of the previous structure, it belongs in a museum....

Engineering is expensive, materials are cheap; always make the process window as large as possible!