Personally I think Bounty Hunter ships should be out of the question. Why would they sell their ships (which they could be giving to their members) to an organisation which does their job for them? The Bounty Hunters Guild doesn't want to wipe out piracy, otherwise there wouldn't be any business for them. That brings them into conflict with the ideals this faction has.
Elsewhere on the shiplist you should include the Eagle, which probably would be a staple for a civilian organisation. House equipment should not be included, for example the RM can't produce enough Wraths for all of their pilots (it's in the infocard iirc) so why should they give/sell them to the ATA? Civilian/Zoner gear only, I'd say.
Plus, I don't see why there are such strong relations with Liberty. Why not any of the other houses, or preferably none of them (considering Zoners generally dislike the rules of the Houses). Also, the Houses probably wouldn't like a "Zoner" fleet coming through their territory.