It looks like the 5 window will be it.
After a few hours looking it over, it really should be saved.
So, the grill, hood and doors from the '49 will go onto the '51. That will take care of a lot of the rusted surface and the bad doors.
Replace the rear lower cab panel and everything will be solid.
Was originally planning not to blast the cab before paint, but now that will be necessary.
Will get another album started to share some pictures.