Everything is possible, and I don't see why this wouldn't be. What scale is it in, are the kits still available ?
If they are, and you are missing some little pieces, or the little ones are beyond repair, this would certainly be worth, buying the kits, and use the necessary parts for the repair. Personnally I could not live with the fact of not repairing a dio, or model, signed by a person closely involved in a historic event.
I'm sure you'll be able to restore the dio in its orrigal luster.