So, thought I'd share what I did for the Yuuzhan Vong species, if anyone is interested.
First, there's the base species, with different Castes handled by "subspecies," reflecting a lifetime of training within that Caste.
Yuuzhan Vong
Brawn 3, Agility 2, Intellect 2, Cunning 2, Willpower 2, Presence 1
Wound 12+Brawn, Strain 12+Willpower
Special Abilities: Caste (select one Caste and apply its benefits), Toughness (add Boost to all Resilience checks).
Starting XP: 90
Warrior Caste: Add one rank to Melee.
Shaper Caste: Add one rank to Medicine.
Priest Caste: Add one rank to Charm.
Intendant Caste: Add one rank to Negotiation.
Force-Sensitive (in my homebrew setting only): Add one rank to Lightsaber.