Well, in our defense, Thundaar is a PA setting and is more akin to Spacemaster than to D&D, IMHO.
And since you are using STAR*DRIVE, isn't there anything else in the book that whets your interest? If you have the book I think you have, there should be some ideas presented on how to run the STAR*DRIVE campaign.
At any rate, the campaign you desribe is best represented by Traveller.
And the Star Frontiers site has every module ever printed for SF... worth a look.