Folding Geocannon WIP

A work-in-progress model in Sketchup of a giant folding cannon and its surrounding mining complex.
Backstory plus some supporting backstories:

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In this universe "plasma" contains information as well as power. A race of sentient double-thumbed cat like creatures (recently started calling them Zios) were artificially placed on the planet, which happens to be a giant construct that runs off 'plasma'. After some time they figured out how to tap into the planet's power supply, and built energy wells to mine it. With 'plasma' being brought to the surface, information started being stored into the landscape.
Eventually the free plasma amassed into high enough quantities to spawn bio-mechanical automations. Information imprinted by animals, plants, and the Zios themselves culminated into monsters made of raw material, and through many years they evolved to become mobile animals. At first they were small and docile enough to be more of a curiosity than a threat, with the Zios not expecting them to become much more than that.
That is, until the Zios built a single massive construct at the north pole that freely emitted plasma to aid with space travel. The automations then became truly gigantic, and a major threat to the energy wells they had built. To protect their wells, the Zios converted them into enormous "geocannons".

This particular cannon was in an east-west valley, facing south. It wasn't in a direct path of the automations, but was close enough to attract attention if too much plasma was used. The cannon was built partially underground and with a large bunker, which it could fold into to hide from the larger constructs. The cannon itself was a limited swivel, high-arcing howitzer that fired 4 meter wide shells that contained molten material. It was capable of firing several shells in succession, but wasn't fired often to avoid attracting too much attention.
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Still a lot of work to be done, slow and steady