Wow.. that's some serious infestation!
My '46 was chock full o' mice stuff.. the little buggers had taken the stuffing out of the seats and made nests right in that header above the windshield.. when I took the inspection plates off, they were just packed full of mouse nest.
Haven't ever seen one so bad that it rotted the hinges, tho.. that's hard core.
I don't know that anybody sells a repop replacement roof, tho. You'll probably have to either replace the cab, or find a donor cab and chop off the top and graft it in on your cab.
