[Suicide Junkie]

Hmm. Make all ships the same size, and just require them to have space-wasting components in order to adjust the useful space?

EG:
remove MCs.
All ships are 1500 KT.
Lifesupport becomes a Lifesupport/Crewquarters combo for play purposes. Size is 20KT.
Crew quarters are 50KT, and free, and 1 hitpoint (zero if you can).
Escort requires 27 Crew Quarters. After adding the required crewquarters, you are left with 150KT, which is escort size!