This is bloody brilliant. A few plot holes, such as why Harry doesn't recruit more from the adult population or instal muggle military to operate everything they can.
Also, there's not much regarding how they use the Ancient's technology - though I would dare presume that Harry didn't design the Phoenix, so much as locate its specs in the database. It requires a LOT of technical know-how to design something as simple as a modern car, I wouldn't even dream of designing a spaceship. But otherwise, what's the power source; some kind of reactors, zero point modules, what? Because, since they can produce them... Well, that solved Britain's energy issues for the foreseeable future. Ancient technology used for medicine, agriculture, military... There are so many things that could be done, with little effort - all it takes is time...
Won't you post on FFN so that I can track it? Pretty please with sugar on top?
Or perhaps you could send me a mail every time you update, though I wouldn't want to impose...