Here is a little reminder about the design and characteristics of bretonian ships.
On the first glance they usually come about as heavy. While not being too large - they do certainly "feel" large. The destroyer and gunboat are both kind of wide and tall - compared to lets say - the liberty ships that are rather long or the rheinland ships that are rather thin and tall.
But try to look at them another time. The battleship is not supermassive. Head/chin and neck are quite skeletal - the engine compartment is almost fragile. Same thing with the destroyer - it is rather sleek. (we must take into account that the "chin" frame is probably rather a replacable module. So the destroyer itself is that sleek body with the multi-tasking connection to attach a weapons-pod in the front.
This image shows how elegant the whole thing is meant to look like (its from the concept art of freelancer)
It is very round, not at all littered in ribs or other stuff. The armor plating is elaborate and rather form fitting.
The models suggested (so far) are a bit too blunt - too simple. I do know that they are supposed to be simple due to the war and scarce resources - but they do not quite fit the bretonian design idea.
Also - Bretonian engines are MUCH smaller than liberty engines. Not only are they able to place them much more flexible over the ships hulls - but it would be rather strange if the engine block suddenly made up 30% of the ships mass.