Thanks Pat! I went ahead and tried my luck at scratch building some hinges. They're not perfect, but they'll do:
IMG_6475 by Brian Smith, on Flickr
IMG_6476 by Brian Smith, on Flickr
IMG_6500 by Brian Smith, on Flickr
IMG_6502 by Brian Smith, on Flickr
IMG_6505 by Brian Smith, on Flickr
IMG_6506 by Brian Smith, on Flickr
I also made a new air filter assembly. The one that came with the cab was a little large for my taste. There were many styles used these trucks, so I went with a smaller style.
IMG_6514 by Brian Smith, on Flickr
IMG_6515 by Brian Smith, on Flickr
IMG_6516 by Brian Smith, on Flickr