That truck is a time capsule which I personally would not alter from what you have right now. I would even leave the ratty cardboard door panel as it is.
The only things that I would do would be to do everything that I could do to find and original seat with a usable seat cover. They are out there, maybe not many.
I would also replace the spark plug wires with original type. The pre-made reproduction ones offered by a few of the vendors are really nice and look original.
You have a gem. I'm really happy to hear that you want to keep it as it came from the factory.
I suggest that you get a Factory Repair Manual. There is one which covers '48-'51 which will be a great help for you to get this truck all up and running like it should. There are lots of guys on this site who would be more than happy to help you along the way. The best way to access them is through the forums specific to what components which you are working on.
Carl
