You'll need to unship the rudder to use an ourboard.  I'm assuming you installed the motor mount doubler on the transom.  The mounting brackets on that motor should straddle the transom knee okay.  You might use an old mouse pad or something similar between the motor and the transom to keep from chewing it up and dampen the vibration a bit, but be sure to screw things down good and snug and check later to make sure it ain't wiggled loose on you.

.....Michael

   Thanks, Michael. I want to be able to leave the rudder in place so I can easilly hoist the sail and kill the engine like the larger boats I sail. I know it has been done. On CL a guy was selling his PMD with an outboard, but he did not respond to my requests for info about his mounting method. Simply beefing up the port or starboard transmom and incorporating your mouse pad idea is the easist thing to do. Thanks again.