Hmmm, where's the logic in modeling own ships??? Maybe your model is very good (no doubt), but when I'm looking on this picture it's crashing everything...
This is not a good configuration of rudder & propellers. The props are way away from each other & from the rudder, so the rudder won't play any role in the ships steering. It'll be logical if the props will be close to the rudder, or each prop will have its own rudder which is more suitable for modern ferries.
I'm sorry if you found something bad in my reply. That was just my opinion. Keep up the good work