I've been working on some new designs for House-specific trade lane designs, which would give some more diversity to the different houses. I've only recently been able to start progress on them, but now that finals are done for me, I should be able to spit out a few models. I've already done some sketches for the designs.
The following design is for Liberty, and includes a more or less generic hub to go in the middle (if only so that the NPCs actually have something to shoot at). The model weighs in at 5,520 tris.