So basically everything?
Judging from that list you still have a HECK of a lot of work to do. From experience as an engineer I can tell you with certainty most of the time needed for a design is in those lost few little details. Where to place servos, which servos to use, which other electronics, where to place the CG, etc, etc, etc.
Not to imply you guys have been slacking off, far from it. I'm just hoping you haven't underestimated time needed for those "last few details".
BTW, will the visual tracking/telescope expert (Whom I can't be bothered to find the name of right now) who couldn't make it to the PARIS launch join your venture on the 14th of september?
Beer, because we all know you'll be needing it :)