Interesting! I have the same boat with I believe the same keel/rudder set-up. I haven't had it on the hard yet so I'm not certain, but I thought I have a spade rudder (from what I can see from the dock). I definately don't have a full keel. Maybe it's a modified full such as yours.
I e-mailed Charlie about it after I noticed it wasn't a full keel. He said they made some with a seperate keel and rudder. He didn't give an amount, though.
Bob, I would love to see what info you have. If you could e-mail me too, it would be greatly appreciated!