Another thought, you should check this but my guess is that the basic size of the COE riser is identical to the standard cab. You might find a trashed cab and cut the spot welds to remove it and then modify it to use in your COE. I did this on my '37 project because a previous owner switched to a rear gas tank, removed the seat riser and had a carpenter make a seat base. Well, I found a trashed cab, cut the spot welds, some 35-40 of them and welded them to my cab. Worked perfectly. This would be more challenging but not really that hard since the tolerances of the modification are not all that tight.
Kent
