I got a little more done this morning. The rear section of the frame is re-attached. I cut some styrene card to create a new "trunk floor". Since the trunk will open, this serves two purposes. It allowed me to square up the rear frame rails, keep them that way while re-attaching them to the main chassis tray. Also, it keeps what will become the trunk floor flat and smooth as it should be. The kit fuel tank will be separated from the surrounding material and attached to the new styrene card. I need to pick up some super glue and putty to finish blending the frame rails so they don't look like hacked up junk.
over view
Close up of added styrene
And another shot of whats left with the bottom of the fuel tank