M_Boats: Kick up rudder for M17

I've seen some information about a fellow who fabricated a kick up rudder from an existing, older rudder (the undershot model), aluminum plates, etc. If that fellow is on the list, I'd like to get some details on how this mod was accomplished. I've actually got three pictures of the end product (can't remember where I got them) but no copy to go with. I already use the Ida-Sailor (now RudderCraft), but I've got an older M17 rudder I can fool around with. Thanks. t