I'd be interested, yes. Having run a Starcraft campaign for about a year and a half at one point, it's a subject I still find interesting. I used Alternity for that, but I do think that the d20 rules would work pretty well for it.
As to which system to use ... hm. My first thought is d20 Modern, mostly because I really like that for science fiction stuff. I think the mechanics work a lot better for sci-fi than most variations on the D&D rules. Action points are an excellent mechanic, and one that I think is pretty appropriate for the setting. The only real problem I have is that all protoss have psionic powers, but they're different. This is kind of hard to get across in d20 Modern, since you can't start as a Psychic. The way I did it in Alternity was that each protoss picked a broad skill (essentially, a discipline in the D&D psionics system) that they got for free. This would probably be about the equivalent of starting all protoss off with the psionic abilities of a 1st level Psychic. Not entirely inappropriate, IMO, though it would require an ECL.
However, the Star Wars stuff might work even better. The different core classes would work pretty really nicely, though of course you'd have to redo the various Force-related elements to a more appropriate system. The feel of the two settings isn't that far apart - both are space-fantasy, with a lot of heroics from main characters.
Just the SRD would have some problems - mostly due to the necessary addition of quite a few skills and feats just to make it a sci-fi game. It's just more work than I think is necessary for the setting, when you've got several perfectly good alternatives.
