Well I made this suggestion because my team have a bunker, and hell, I really LOVE this base, the map is really awesome. But well, we have this bunker since months, and I've enter in it two times... Because it is 4 square under Necropolis...
It's the worst location I could imagine except the Glow, for a PvP team fighting in north. We never gone here and we absolutely don't use this awesome base (I fear it disappear for inactivity one day) because it's so far away... And it cost 500.000 caps!
So I just suggest to add the possibility to have a bunker in the northern part of the map, to make it usable.