Just having completed a lot of panel replacement on a "50 AD, (floor and toe board area and inner cowl panels, still have the lower outer cowl panels to replace). Your cab looks restorable to me, but will require a lot of tedious time and some skill in replacing the hinge pillars and the other body work. Meanwhile, I would look for another cab, either Craigslist or Ebay, or some of the local swap meets around North Texas, as it would be cheaper than the $8-9000 range I think the repop cabs are selling for. There's a big auto junkyard down around Belton, wanna say it's Little Valley auto ranch, check with them. Good Luck to you.

Mike