Just a word of warning with the Embassy treaty thing

The party owning the Embassy should not be able to choose what planet. That'd give them free reign as to what systems that they can legally say "I can be here" without punishment or somestuff. While the Equestrians might not think of it, one could set up an Embassy on, say, a very important industrial planet, and then some time later, after more negotiations, the person with the embassy may decide to attack. With access to one of the pre-existing big-and-important industrial nodes, they'd have a major source of information, assuming that when a ship is built, it comes standard with galactic maps, planet locations, etc., which would lead an attacker to not only have a brand-nes industrial planet, but also where all the other ones are.

That is, unless you don't just have different planets make different parts and then throw them across the galaxy, which would be expensive, since I don't think light-travel would be CHEAP, especially with big cargo, to assemble somewhere else, and then to go elsewhere for each bit of information to upload into the ship database.

Or I'm entirely wrong, in which case, you can ignore me.