The terrain will dictate the type of structure underground that they would use.
In the case of Primes Cannon location, there are a lot of horizontal mines in the area. Tunnels would be the best option as discussed in 2015.
How feasible would it be to build 4 story cylinders under the guess of a mining project?
Since TML is now in caretaker mode, we really don't know what Terry had in mind for the revised Prime Base, outside of the stuff posted here and on the mailing list back in the day.
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