Chorpa,
I played in a very entertaining Spacemaster game during the FGcon in July. The game was run by Dakadin, who is a very regular poster on the Fantasy Grounds RMC forum, and also has put huge work into developing the ruleset.
Fantasy grounds is very tweakable (if you have a bit of skill) and there is a fan RMFRP extension available which changes the stats and skill. A SM: Privateers game is definitely a possibility, and you will not be short of RM players to join your game (or players from other systems who want to give it a try)
I do suggest posting on the FG forum (under RMC ruleset) to ask about it before committing - you will find everyone supportive and friendly. I also guarentee that Dakadin will post back.
Here is the link for the FG forum:
http://www.fantasygrounds.com/forums/forumdisplay.php?f=65
Good luck,
bennis1980