Lots of possibilities here. And yes heavily weathered is the way to go. In 30 years of running equipment. I only got to run two new dozers, one new wheel trenher, a number of excavators and loaaders all new and or used and abused.
So I will be watching this build with a good deal of interest. As I have several junkers and a couple fresh dozer kits in the stash.
be Well
Gator