This afternoon was spent welding up all damage on the driver's seat frame and getting it set up in the correct (to me) location in the cab. I was surprised to find that the driver's seat sat 7/16" higher than the passenger side with the same height of steel pegs for mock up. So the driver's side seat will sit 7/16" closer to the floor so that the backrests will sit at the same height. Works for me as I need all the space I can get being 6' - 2" tall.
Next up will be fabricating my seat brackets.