I got around to installing my Van Dusen over-stern kick-up rudder this weekend on to my Epic V10L. This is really a slick unit - simple, clean, and elegant. Installation basically requires the cutting of a slot in the stern of the boat, and epoxying the blade on the hinge in place. A long screw/hinge pin can be removed if the over-stern rudder isn't needed, leaving only a small part of the hinge sticking out of stern. For connection to my rudder cables, I removed the rudder assembly cap and tied directly to the cables. I may improve the appearance later by installing some tubing in the hull to keep the cables hidden (and allow me to replace the cap). In trials on my pond I noticed the over-stern rudder didn't track quite as well as the under-stern, but it responded well and seemed to turn every bit as tightly as before. This is a good option for those of us using waterways full of obstacles.
The first picture is from Van Dusen of the rudder assembly; the following pictures will be of the installed rudder assembly on my boat.