LATINUM DEPOSITS: I would see to send a Transport Ship to a planet for the Latinum collect "remote" (example based on Space Empires 5) and add the function: collect Latinum (as the function Collect Deuterium, for example)

you should rename and replace ANCIENT ARTIFACTS by ALIEN ARTIFACTS

RARE CRYSTALS- System with rare crystals generates +10% or 20% income from trade routes, this bonus is random and is determined at beginning of the game.

I think if some planets are not owned by the minor races and have some RARE CRYSTALS, should do the same thing with Transports regarding the LATINUM DEPOSITS and add the function: collect crystals