What is so sad about the constructs being empty? I mean if you wanna kill the boss you can arrange it with your faction members or whoever and go there together, but I like being the only person there. That makes the atmosphere better. But sorry, this doesn't have anything to do with the thread.
As about the gameplay meaning of the constructs, they're supposed to be free-fire pvp areas even on non-hostile servers (as everyone knows), but since everyone uses Mara c for pvp it's not a miracle that the constructs are empty.
But the way they look and differ from the common city is worth to forget all those little details 
But hey, great idea