ScrumbleShip is the most accurate space combat simulation devised to date. Gather resources, construct a capital ship out of individual blocks, then pilot it with AI or human help against other players.
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I've always loved this mod. I'm not sure it'll ever make it into the game ("Maybe. *Sniff* Maybe." +3 Bonus points for the reference) but it's quite cute and fits on the table well.
It's also a little big, at around a foot across, but that's just the fault of ScrumbleShip's voxel renderer.
Cheers,
-Dirk