I can't think of a better "theme" for Rogue Space RPG than lifting from the greatest of Sci-Fi cartoons Star Blazers! It's theme song is perfect and the cartoon is a big influence in how I view and think about Sci-Fi RPG's.
One choice I made is to use Three Archetypes in Rogue Space: Warrior, Rogue, and Technician. Note, those are Archetypes-NOT classes. I do not know if it will translate to everyone but I thought about people at my work and how many have the same title (class) who they are and how they react problems can really be defined by one of these archetypes broadly. So Rather than have a Noble/ Entertainer multi-class, or Jump Pilot/ Politician you can just call yourself that if it helps.
Instead your attributes kind of determine how good you will be at doing something regardless of your "class." Instead your Archetype for dealing with challenges will have a stronger influence. So if you are a noble with a "warrior" Archetype you will be more prone to answer challenges with death stars, not diplomacy. Or if you are an entertainer with a Technician" archetype, you will probably be overly concerned with lighting, sounds checks, stage design, etc as the major part of your performance. Is it splitting hairs? You can decide if I was successful or not.
Off to your right you will see a Rogue Space Sorties picture...click it to get to the downloads section. The Basic rules are up as both a Pocket Mod and standard page size so download, read them, and please let me know what you think. Your reaction, or failure to do so will have a major influence on if this is a solo shot, or becomes a full space program.