Remove the chrome hardtop crosshead screws from the panel in front of boot opening, but leave the chrome trim pieces in place as packers for roll cage feet. Trail fit new GRP parcel shelf and loosely place roll cage over it. Mark around rear foot plates so that holes can be cut out of panel to allow fitment of roll cage.
Bond and screw on the top mounting panel/parcel shelf.
Bolt roll cage/shellbrace to 12 existing captive nuts on shell, at hardtop 4x mounting points and 2x soft top