A. Current Biremes (light warships)
B. Current Triremes (medium warships)
C. Current Quinqueremes (heavy warships)
D. Dudes collecting seashells by the sea shore (for scale, with the dock)
So, I'd say the light/bireme class would remain the same size as they are now, which is A. Then the medium/trireme class (B) would be shrunk down to the size of A, but would be bulkier and have a foresail. Quinqueremes (C) would be shrunk down to the size of B. They'd retain all their detail and come with a catapult aboard.