Do you know if said panels have been re finished at some point ? coz if so it might be cheaper to find panels off a broken car ?
I know its still money needed to purchase the parts but they do go for nothing, thats if you can find one in your colour, i know i could never find one in flat black lol!
re rear screen , most glass places can do it mate, should not cost you much, real shame you are not local as my mates bodyshop uses a guy and he charges £10 to remove and replace bonded glass