Here's the final product of both the lee-board and rudder/tiller.
The lee-board, with a line through the top, is bolted to a spacer block (the size of the gunnel) and another piece of plywood that fits on the inside of the boat.
The rudder/tiller is in four pieces. There is the rudder head with attached tiller (glued and bolted). There are eye-bolts through the front for a pin piece that slides through these eye-bolts and corresponding eye bolts on the transom. The bungy cord (wrapped around three times and tied) stays with the rudder head. The rest of the rudder works like a dagger-board. It is able to slide up and down (held in place by the bungy cord) and can't fall through due to the rope handle. If we were to hit anything it can also "kick" backwards and shouldn't cause any damage.
This is quite a creative solution that we borrowed from someone who says he borrowed the idea from some racing dinghies. Another claim is that one can continue sailing in quite shallow water. In practice we've found the rudder system to work great.
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