Dave,
I use a cable with a padlock to keep the motor on the boat. Should the  motor 
mount ever fail, the motor could be easily retrieved and not from the  bottom 
of the lake. The cable is stainless, aircraft grade materials.
The through hull on the starboard side is more than likely the sink drain.  
Look under the sink and you should see the drain line. I'm not sure how your  
boat is equipped, but it's possibly the vent on the port side is for the 
holding  tank for a marine head.
Getting the head sail to come through is not difficult unless you are in  
extremely lite air. I use pvc pipe to cover the four forward stays to help  
eliminate hanging and also save the sheets and sail from abrasion.
I have attached a link to our web site that has many pictures of the way  our 
boat is set up. You will see several pictures of the pvc pipes.
 
Rummy
 
_http://members8.clubphoto.com/kimberly513138/687351/guest.phtml_ 
(http://members8.clubphoto.com/kimberly513138/687351/guest.phtml)