Are there beds? How can the modules have things like a med-bay? Are they capable of long haul shipping, particularly A/B?

There are beds, and the larger ships have room for more medical facilities (for the A and B, think more about an emergency kit under the seat.) Both the A and the B are capable of long haul shipping, and in some ways are even superior; they have more speed and maneuverability for traversing the more dangerous regions of space.