The turrets on the Hammerhead look quite fragile. Will this be true in game making its greatest strength also its greatest weakness?

To an extent, this is true - the Hammerhead's turrets are somewhat exposed. Of course, as you can see from the turret emplacement design, this exposure is also what gives the Hammerhead's weapons their excellent coverage and arcs of fire. It's a tradeoff you'll see in many weapon designs, in history and in the real world, in everything from tanks to warships - protected, hull-down, heavily armored weapon batteries tend to have limited arcs of fire, slower traverse, and other aspects that make them more cumbersome or unwieldy than lighter, more exposed designs. The Hammerhead is a patrol and escort ship, tasked with screening larger ships from fighters and small attack craft, as well as providing patrol in force primarily against non-capital ships. When arrayed against its intended targets, being able to bring multiple turrets to bear and overwhelm small targets with direct fire is the Hammerhead's preference, especially when those smaller ships are not attacking the Hammerhead, but the charge the Hammerhead's been tasked with protecting. The Hammerhead is a defender, but a very aggressive one that believes that the best defense against small ships is a good offense. What does this mean for the attacker? You know that the Hammerhead's turrets are a relative structural weak point and might provide an entry point for boarding if attacked specifically. It might be a weakness, but we'll leave it to you to decide whether it's actually one that's easy to exploit.