I understand that actual SDB organization will vary widely, but still I would think there is a sort of "best practice" for organization. Especially since SDBs can fall under Imperial Reserve Fleet command.
what do others think about this: individual boats in the 200-500 ton range are generally organized into divisions of 2-6 boats. Many divisions will also have a tender of 500-1000 tons to provide logistic and repair support - not a jump shuttle/tug.
this would be a best practice, actual organization will vary widely.