The problem with official faction is it sounds like a few guys who said "yay I'll get a battle**** and any others will have to get smaller ships so I pwn 'em all".
Unfortunately, that rank thing any factions have is telling this.
Look at the [RA] for example, they are all using OC destroyers with like no superiority while the LN recruits can't even get nuclear mines, sunslayers or razors for a fighter. Well that's why I left the LN and why I won't join any official factions but the 2 I'm in.
I'm in OPG, and it could be also any corsair faction, cause it's really easy to reach the marauder rank that allow you to get any ship up to gunboats. Even a rat can have a bomber with everything he want (limited to what rules allow of course) mounted on. Also I have access to one of their cruisers if I want to use it.
Only thing you have to do if you want a big corsair ship is to do not include [OPG] in the name.
I'm in the Lane Hacker not for playing as I want to (I got my bellerophon in liberty as well) but only having fun, but nevertheless, you can have a pirate transport as technician, that gives enough power and cargo to be a real treat to traders.
Unofficials are just here for some guys can enjoy the capital ships without having to waste so much time before they can have their ships.