Haven't used those tracks so no help to you there - great progress though.
Prime them with a flexible primer like Vallejo, and then paint and weather as per normal.Tracks in the Dragon M-103A1 are the same DS style. Easy to work with. http://public.fotki.com/ScottM/models/dragon-m-103a1/
I really like the lines of this thing . So the 2 cm retracts down into the turret ?
Great progress on this.