The Pi use much time to build more then one routes when you have more then one Launcher Pad. Can you made it a bit simpler to made a Laucher Pad per Upgrade Bigger. IF you build a second at the same place or Upgrade it. So it will be once not two.
I think it will much Lesser time an Stress if there are only one Spaceport and not much more then one. How it madeable is your Part!