Airports:
1) Design for Airport atop GreyStone
2) Helipad atop mini angular Brownstone.
Bases:
3) Resource base which will convert excess resources into easily stored blocks which are dropped into an SCU for long term storage.
4) If running the newest unstable version 0.7.3.2 feel free to improve upon http://forum.terratechgame.com/index.php?threads/zeds-tech-zoo.9126/#post-61136 in terms of symmetry, efficiency, defensive capability.