On Star Trek TOS, you will see a complete mod from the Kirk era made with the stuff from Star Fleet Command TOS mod and many more new things. Thanks to all these creators, this mod will be finished very fast and with great quality. At a first place the mod will add only space combat but for a non too far future, I wait add ground units.
At a first place, I will use ground maps most of them from the original EAW, it can sound you poor but if you think how most of all SW structures are replaced by ST structures, the game change a lot. About aliens, I suppose that perhaps I can add some of them.
What do you think of the Cardassians, Nomada?
I feel that I will add the TNG with the Dominion Wars when I finish this new version from the mod. I suppose how I can make ground units from Cardassians and Dominion with just see how their space units are, at least now, I have a very good idea about what would be the most fun.
@mentatjedi This is supposed to be original series era.
Not really, there are two eras in ST, the older and the newer re-boot. This mod would be from the older but you can put at this the TNG.
If this is still being worked on, I'd recommend adding the Dominion as a fourth faction with the Jem'Hadar's phased-polaron beams able to ignore shields the way the Zann Consortium does. Also the Borg would be a good addition if you can make them tough (and the ability to "assimilate" ground units through the corruption ability). The Zann Consortium tends to steamroll GC and needs enemies that can make their work cut out for them.