I was thinking about converting the Starcraft Terran's and Protos's fleet into Armada system, I love the video game and there is similarity between the navy. But as there is not much diversity so it's down to maybe ten ships or squadrons.
For this to work we'll have to list all the convertible units :
Battlecruiser : based on its model, it could be a large, medium or even small ship, with the Onager mecanic.
Wraith : standard squadron of the terran navy
Carrier : large base with maybe a hangar bay system with unique squadrons that prevent it to move when they are out.
Mothership : huge ship similar to the Lucrehulk-class Battleships