The first four combat drones(Basic Light weight, Light weight, Light, and Medium) are the same except for price. They look the same, and they do the same damage.
Make Imps consistent
A +1.8 imp gives a +1 Stat, while a -1.2 imp gives a -2 Stat
Construction and Research missions are boring and don't give enough xp for the time it takes to do them. I did an hour of research missions, and earned less xp than I did in 4 minutes of droning(TL3 Light weight attack drone).
Maybe have the constructors, and researchers(engineers, and scientists), start off with drones instead of pistols since droning level intelligence faster.