And don't listen to Sombre, nothing wrong with dominions 3000 and it could surely use more nations
And if you are saying most of your idea's die it might be better to start with making just a nation (for dom3000 I'd say) than reinventing the whole problem with spacecombat again

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Want a blend of
fantasy and
sci-fi? Try the total conversion
Dominions 3000 mod with a new and fully modded solar system map.
Dragons wanted? Try the
Dragons, Magic Incarnate nation.
New and different undead nation? Try
Souls of Shiar. Including new powerfull holy magic.
In for a whole new sort of game? Then try my scenario map
Gang Wars.