I would recommend the addition of at least the following to the stock requirements:
Scout - we need something that suggests a small ship sacrificing firepower for speed and/or range
Baseship - OK, it's already referred to in the data files, but no stock shipsets actually have any.
Worldship - for the doom stars, deeath stars, terror stars, battlemoons of our evil overlords
Resource Ship - for robo-miners and such (don't really need a resource base as the base hulls are general purpose - only the Battle Station has a military connotation)
Infantry - for non-mechanized troops
Additional ideas:
Space Monster - for monster races and perhaps monster tamers / magic races / robots gone amuck in various mods
Monster Troop - monsters for invading planets! (If your race is able to tame monsters or build maniacal death robots, it is reasonable to expect that it could use both its own people and the monsters/robots as troops, and should have different models for the monsters/robots than for the regular troops!