the hinges are actually pretty easy to restore.
first drill out the pin with something like a 1/8" bit.
drill half way in from each side. then drill out with a 1/4" bit.
at this time you may be able to punch out the pin. if not then drill out with 5/16"
buy some 5/16" x 4 1/2" grade 8 bolts. this will give you an unthreaded portion of 3 1/2"
profile the heads like i did here.
http://halftrackinfo.com/index.php?topic=1220.0install and cut off so that about 5/16" sticks out. heat the end to red with a torch and hammer it.
place it on a flat table and make sure it lays flat, if not you can clamp it to a steel table and heat the joints until it does.
i did this a long time ago, this is what i remember.