"Well, we've mostly just been sticking a shoulder to the gates when we need to move them. So the walls may not work out."

Spoiler: Ranborg
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You recognize the design of the doors. There really should be a counterweight system hooked up to them to make them easy enough to open or close that you could route the work through a lever, and the mounts needed for that do seem to still be intact. With someone to do the manual labor you should be able to fix that fairly easily.