Hey there
My group recently acquired a G9 rigger, and the clone wars shows that's it's able to at least fit a delta-12 skysprite in its cargo hold, which is listed as silhouette 3.
The g9 rigger doesn't have hangar bays, but still has a magnetic field which allows to at least launch and recover a small fighter from the cargo bay while in flight, unlike many other ships.
The question is: how much cargo space should a cargo bay take? 10 per silhouette? More?