Welcome to the Case forum. A hamerstrap should be no problem to fabricate. As mentioned an after market cab on an EH tractor is a rare bird. Most after market cabs at that time were pretty ugly, but that one has some style to it, not just a box bolted to the axles. The cab looks like it perhaps has provisions for fenders to be bolted on it like the Allen factory cabs had. What brand is that cab????
I also have a 831C high tin Eagle Hitch tractor. I removed the well worn wide front and installed the narrow front. It is a much more maneuverable tractor with the NF. Mine was a really ugly critter when I bought it. I did a lot of fabrication work on it to suit my likings and needs.
We had a really nice day back the first of last week so I thought I would see if it would start. It hadn't been run since last Oct. It fired rite up so we went for a ride to limber it up.