Single player?

Never have one - replaced by Galactic War. Not to say that some modders won't create one, which I hope they do, as i've always loved my campaigns.

Ok, this sounds like the original Pax Imperia, or Spaceward Ho! then, but mixed in with planet-by-planet (system-by-system) battles against AI then?

In those games (which I have also been badly missing) you took over a randomly-ish generated galaxy star-by-star. Both were space battle-based, though. A planet battle-based concept would be interesting.

Press ready once you have selected a spot. It will load a comp up quickly, it only really builds bombers but at least it does stuff lol.