Hi,
I am getting lost of the thread, it would be good to have a dedicated thread for each of the thing you want to do with assetbbundle.
but yeah, right now working with the manifest seems odd, and I haven't fully grasp how it works unfortunatly, as it seems to require some kind of voodoo I haven't figured out yet.
as for the versioning, have you checked with Eric ( tmeric forum member), he provided some proper support for assetbundle, maybe he has already what you need covered.
Bye,
Jean