For the most part, looks pretty good. I think the date the minefields were built can be found somewhere, I believe it is somewhere between 200 and 300 AS. You can use this to come up with the date the exploratory service found Sirius.
My only real problem is the relation with the junkers. The junkers are a separate faction who were controlled, to a large extent, by gallic intelligence services:
' Wrote: Q: It appears that Gallia had an extensive espionage network in Sirius. Do we know anything about the spies? A: Espionage network was built by a well-known faction currently present in many areas of Sirius. This faction was initially founded in Gallia by a group of colonists who had anglo-saxon origins. Later, Gallic intelligence took the faction under close control. Presence of this faction was extended to Sirius, namely Bretonia and Liberty; nowadays, most members of this faction are completely unaware of its true origins and goals.
My point is, the GSS did not build any bases in Sirius, the junkers did. GSS agents posed as junkers, this is true, but it seems like it was the junkers did most of the infrastructure work while the GSS was busy with intelligence gathering and espionage.
Finally, I dont think this faction or ID existing should keep junkers from being accused of being spies. It is well known within Gallia, at least to the council, that the junkers or those posing as junkers served as spies in Sirius and probably in Gallia as well. Any junker would be suspect in the eyes of the council in my opinion. This is how I have conducted the RP of the LPR, especially considering it was Gallic agents posing as junkers that raised the factions founder. In Sirius though I dont think anything should be known about the junkers being spies yet. Once trade officially opens up between Sirian corporations and Gallia and the Council and governments of Sirius sit down and have formal talks though, this will most likely change.
All and all seems pretty good though, I look forward to seeing more.