hi
ive actually converted mine from a 3 door van type to having seats in the back,
i did find that when i went to a breakers to get the seats etc, that there were plenty of brackets etc required
found it easier to remove the hardtop to remove the cage, wood etc.
dont know if thats helps but if you need more info please feel free to contact me
plus i agree with OP about your insurance.
all the best
gary