Its all highly confidential, maybe you should get your passport sorted out and come and inspect it yourself !!
Its a simple box section frame that goes along the rear of the seat ( to help brace the seat back ) which is then tied to the floor and braced to the rear of the car, i need to put another brace across the bottom, but i need to get some more steel, i then extended the rear shelf with a nice thick steel plate.
The rear seats are bolted down to a custom made frame, so that they can be removed if needed and that allows the rear to tilt flat.
You can get hold of the frame and shake the whole car with it, i then covered the rear panel.