First, I know there is a Stargate RPG put out by AEG; I don't see the need to buy a $50 book with slightly different rules when most all of it could be done with the d20 Modern books I've already got.
Anybody ever tried to run a Stargate campaign using d20 Modern/Future? I've been thinking about this a lot lately, and was curious if others have worked up something similar.
I was planning to base the Gua'ould on the Tsochar from Lords of Madness. I'd change their size to Tiny, and remove the 1-year restriction on possession, and have the possession ability not kill the host (and allow the Tsochar to toggle back and forth between Inhabit and Replace [for the Tok'ra, for example]), but I think that would be a reasonable base for a Gou'auld. Perhaps the Jaffa would be similar to the Tsochar's Inhabit ability, but with added immune system benefits/detractions
I found some errata'd Staff weapon stats on-line that give me a decent base to work from in recreating them (the Stargate RPG has a different action economy system, so extrapolating the firing rate is somewhat difficult. Probably just make it take a standard action to fire it unless you have some weapon-specific feats) It was quite interesting - they did 6d6 damage, and had 50 shots, but the shots replenished themselves at the rate of 1 per 5 rounds.
A Zat would probably do something along the lines of 5d6 nonlethal damage on the first shot, with an additional saving throw to resist unconsciousness (Fort DC 15?), while a second shot within a few minutes would do 5d6 lethal (possibly with a save or die at the same DC?)
I think Stargate would make a great vehicle for a d20 Modern game, because it's a secret government project, generally has fairly encapsulated missions (one or two game sessions per mission, probably), and the military base/unit structure facilitates character replacement if your players get bored with a character, or one gets killed.
Thoughts? Ideas? I'd maybe be interested in playing a play-by-post game if others were interested.