0-32 = Fighter
32-64 = Corvette
64-128 = Frigate
128-256 = Destroyer
256-640 = Cruiser
1000+ =Flag ship, Mother Ship, Titan
This is wrong, if you followed this criteria then if a ship was 256 blocks long it would be classes as both a Destroyer and a Cruiser.
Another problem, what if a ship was 641-999 blocks long, what would it be classed as?
0-32 = Fighter
33-64 = Corvette
65-128 = Frigate
129-256 = Destroyer
257-640 = Cruiser
641-999 = Command ship
1000/1000+ = Titan