Yes, Cat C write-off so will need all relevant testing/paperwork etc. What is the problem with the seal, are they a bugger to get on?
I assume you're talking about the boot door only? No, gap at top of hatch seems normal, gap towards bottom opens out away from the car. Can be seen in one of the pictures of the side of the car. You think it's not worth the effort then? Car is just too good to waste... 
I know man, absolutely gutted when this happened! Loved that car... My new Micra is crap in comparison...