If the golem can freely move its own parts he could make some cannons to shoot hardened dirt balls from it with an internal piston (part of the golem, so it can pull and push it at will). Make a lid on the back part and you have a moving hideout as well.
I can't believe he can just walk through the barriers lol. I thought he'd be stuck like Han-Bin (Survival Story of a Sword King). It definitely feels like the walkway gate picture where the lawn next to it isn't covered by fences at all. The absolute ridiculousness of his buggy status.