For some real feedback:
The concept appears interesting, and marginally well thought out.
I can't really say more until you bridge the gap in history between where you left off and present day, and clearly outline what you'll be doing in Sirius.
If you need help with that, dial me up on Skype.
I had to go through all of Sirius' history recently, going after DSE and Ageira information.... I should probably be able to assist you with anything that has to do with early/mid/late Sirius history.