We ended up drilling out the rivets and moving the back pully. and creating a strap over the back so that we didn't have to drill new holes through the skin. We drilled new holes through the floorboards and riveted those as well. We cut the plastic rudder cable close out so that the cables could pass through. We then measured, cut, and riveted the rudder cable mounts to the floorboards. We matched drilled the tunnel to the mounting rails and then installed the Timmermans.