Unfortunately there are no drains, and that exposed plywood that you see is also the core of the side deck outboard of the winch islands. A cover may be your best bet, we had the same issue but couldn't come up with a way to fix them without major surgery.
Kevin at Mallard does great work and can do custom hardwood parts. http://www.mallardmarineservices.com/services
http://www.mallardmarineservices.com/blog/2016/8/23/bulkhead-mount-compass-box
I have the same setup on my 75 35-2. I'd like to remove the adjustable boom track altogether and move to a gooseneck. Does anyone have any advice on setting the correct boom height? I'm assuming lower is better?