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That's exactly what I use Fistful of Lead: Galactic Heroes for. I can use my old 40k figures, my Pulp Sci-fi stuff, my Aliens and predators, etc. It's all there.
I really thought Rogue Stars was going to be SoBH in Space.
Please no.Frostgrave is ok. It's fun to a degree but it isn't flexible enough to be more than a treasure grabbing wizard off. That's not to say I don't like it, I have enjoyed games of it, but it is no where near flexible enough. You want more scenarios not involving treasure grabbing to win.
Personally I also think we have arrived at a time when games don't have to be dictated by the limitations of a d6. Tabletop gaming is a popular and pretty mainstream past time and the old concept of using d6 because everyone has monopoly is a bit outdated now.I'd push to d8 or d10 and allow for a lot more differentiation between troop types and weapons if desired.