Okay, here's my final idea.
The Rebel systems will be unavaidable until you do their first mission.
The avaidable ships are as follows. If they're unique to Pirate planets, they'll have a 1 next to it, unique to rebels, 2 and unique to Colloseum planets, a 3 (p.s on Rebel planets, you can ONLY buy rebel ships).
Defender,3,1
Manta,3,1
Hawk,3,1
Patrol Ship,3,1
Galaxyfighter,3,1
Lightning,3,1
Rapier,3,1
Corvette,3,1
Destroyer (mod aargosy one),3,1
Dragon Frigate,3,1
Confed Frigate,3,1
Rebel Cruiser,3,1
Antonida Dreadnought,3,1
Dreadnought,3 (only after certain missions)
Antonida Freighter,1
Rebel Hawk,2
Rebel Destroyer,2
Rebel Freighter,2.
There are 15 weapons (including a secret weapon), 18 outfits (2 unavaidable to purchase, given to you after a mission).
Each major ship design company will have a station in a neighbouring system to the Colloseum, you can accept missions to sabotage their nearest rival's convoys.
There are no mission strings for pirates, but you can accept a drug-smuggling mission (pays well, but the government you're smuggling drugs into will hate you).
The Colloseum mission string contains 3 tournaments and some anti-pirate missions (since the Rebel systems are hidden, you cannot do missions to destroy them.
The Rebel Mission string consists of blasting Confeds and Pirates, and some double-dealing.
There's one pirate system in Rebel and Confed space.
Okay, that's it, any commets, suggestions?
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Name:Zax
Age:14
Hobbies:Monopoly,Reading,EV
Pets:Carniverous Pig