I agree.
I was going to have further types spin off below the top divisions. Each type would have specific requirements or mins is areas. For example starcraft of civilian/industrial/military would be required to have at least 2 life support systems for long duration ships and maybe transports might be required to have 3 life support systems.
Below the top fields I have the following:
1) Scientific
2) Exploration
3) Transport (people)
4) Transport (goods)
5) Work Related (mineral extraction, building, very short range cargo movement, repair, etc)
6) Defense Related (Protection, Escort, EW, Carrier-V(ee's), Carrier-P(ersonel), Carrier-C(argo), Patrol, X-Craft)
7) Living (space station, hab colony, slow moving settlement)
More comments would be appreciated greatly.
MDC