Regarding the hi lift, I have ended up putting thick pipe foam round the top and mounting it along the floor, under the edge of one of the side mounted rear seats and onto the fuel tank cover. It just clears the tailgate, sits snugly against the seat frame and is secured to that and the roll bar base. Release three Velcro straps and out it slides so, at the moment, I've shelved the plans for mounting from the door hinge and I never got a reply from the guy in Oz.
Did you get you hi-lift mount sorted?
Regards,
Rodger