thanks, it's a good conpromise between having a stiffer, lighter, impractical & noisier rear end on trackdays and then easily swapped back to a practical, quieter setup when used daily.
the extra side door openings doesn't seem to cause an issue cos all the door latch lines up fine before/after twisting.
the main cause of the twisting is that big gaping boot hole in the chassis, like a wide open cardboard box. great for boot access but makes the structure so weak, floppy and little squeaky, especially when cornering hard.
the x-frame should help reform that closed cardboard box lid structure, rather than rely on the loose boot lid to hold it