The Oz
SOC-14 1K
IM(various)TU(s) I did variants of the type-S with faster manoeuvre drives and/or more payload, which make them desirable for various parties to use or modify. This made for a whole bunch of variants with different payloads - ambulances, executive transports, patrol craft with uprated power plants and weapons etc.
IMTU I designed the Type S at a higher TL (13) which allowed both a fast (4-G) and a long (J-4) version. The fast version was just like the Bk 2 version, but with 4t of cargo. The long version was very cramped, with either one stateroom and 4t cargo, or two staterooms and no cargo; no air/raft either.
The fast scout was an upgrade available on mustering out to scouts of exceptional service (multiple rolls of "Ship" when mustering out). The long version was a "frontier X-boat" for places without X-boat tenders. It was not available as a mustering out benefit.