Now that in the next beta, energy reactors and harvesters will blow up on planets not owned by a player, and energy reactors leave remains, will remains rebuilders be unable to rebuild energy reactor remains while those remains are on an enemy or neutral planet? If not, then either a) this would be a way to "cheese" the system to get energy reactors on neutral planets, or b) they would rebuild, then get destroyed immediately, only to get rebuilt, ad. infinitum until the planet is re-taken.
I do think that "death by command station dying" should leave remains so it is still easy to rebuild that planet, but this is one loop-hole I wonder if you though of.