Behind the drivers side there is a grommet that is used for the hard lid. You have to pull the back section of the tub liner to be able to access this grommet.
Inside the cabin follow my how to on how to install a sailplane to know how to take apart the interior. The back cover just pulls off easily. You should be able to figure most of it out from the inside.
Drivers side in the tray you will have to take off that cover and thread the wires from the back wall behind the liner.