I used a piece of Starboard to make it just high enough so that the motor would not hit it while being able to slide it into its slot. I intended to add another piece with a hinge to make it higher.
After 6 years and many experiences with water at the stern (backing down, green water breaking over the motor, etc) I can tell you that the extra piece is not needed. I've often got lots of water in the well, but on more than a quart or so in the cockpit under my most extreme conditions.
