One thing with this model is that the scale rudders are pretty small. I made mine bigger for better steering control and with bigger (longer) rudders you can increase the angle of the shafts and still keep the prop higher than the bottom of the rudder.
One thread you need to look at is Classic Boater's build on his 63' MY. It's very detailed and he tells you how and why he built the model the way he did. It's a beautiful example of what can be done with this boat and it runs great in the water. May answer a ton of your questions. Also for pictures of finished 63''s check out the thread for "Sterling 63' MY owners". Lots of info there too.
Your name will be added to this list too if you actually build the model. Pete