I'm sure its been done before (or at least something very similar). An "adjustable" skeg on a SOF is often not a drop-down type skeg, but a removable skeg accessed when the boat is out of the water. You adjust it by having different sized skeg plates to add (or remove altogether).

If I were adding a skeg to a SOF, I would position it so that it dropped through the keelson. This way, you can add a rub strip with skeg slot over the keel in that area to help protect and clamp the skin in place. Trying to place the skeg off center would only create more headaches than necessary (at least in my mind).

: My mistake. I meant Skin boats!

: How do you seal a skin to the frame where there is a seam under water. Like
: if you wanted to do a skeg.

: Or I have seen Baidarka's with varnished wood bows and the skin was somehow
: attached and sometimes below the water line.