The mobile artillery is fantastic, but—in my opinion—it has a flaw. When firing in automatic mode, shell consumption is massive. The target is already destroyed, yet the shells keep coming. I gather that the self-propelled gun keeps firing until the target's destruction is confirmed. It looks odd. The logic of the vanilla artillery seems better in this regard; vanilla artillery knows it needs only one or a few shells for a single target, so there isn't such excessive waste.

You're right, and thanks for the detailed report! Fixed in 1.2.2: like the vanilla artillery, the truck now keeps track of the damage already on its way, so it won't fire again at a target that the shells in flight will destroy, area damage included. Moving targets too: it won't fire twice at a biter while a shell is still in the air.

Excellent! Death to the bugs!