Something I would think would be great is showing your PMB on the map to allies. Only way to do that is by OS but it shows your base to the enemies too which can turn out to be very bad. My suggestion would be to give the structure 'Faction Banner' a new ability which will show your base on the map for only allies just like the markers squad leaders have. I know this costs real money. Maybe it could be unlocked in the Strategic - Construction objective for receiving Adept or Expert level. What this will do is help your allies notice that there is a PMB. Most of the time nobody even knows you're building something. The Faction Banner would also show that this is a serious PMB because getting the Adept or Expert level is not easy, not something a new player could get quickly.