Didn't the dummy plugs only work once when it served the plot?

I agree that it helps fill out the top of the turret, though, so go ahead and leave it. Heh--or write some lua which detects which team it's on, and show the hatch if it's under Arm control (via capture, rez, or whatever). That'd be a silly but neat minute detail!
Anyway, this is what I meant by the bevel:
Just to soften the shape a bit, but keep it angular and blocky and in Core style. Those hard corners really look strange to me next to the front end and the turret, both of which lack hard 90 degree changes like that.