Not all water towers were round. Styrene sides, maybe some rivet tape and seams. Roof optional.
Kinda like the airplane, but a "roof mounted" beam crane instead?
Make a roof and paint it, weather it, add detail to it, etc. (use the shape, create the texture, detail, and change the feel of them.
Combine them as signal bridge. Make a walkway between them&, make or buy, stairs.
Find more and cobble some electrical catenary towers.