I would suggest that you find a few A400s and take lots of photos and make an inventory of the
multitude of parts that are unique and very hard to find for this Model, and consult (if you can) with experienced restorers like Brent Terry and John Hash. Do
not expect to buy parts off of other A400s. This is a job for professionals, and if that ain’t you, this project will likely end up exemplifying your screen name. I do not think this is a good or even a feasible idea. And that will be my last word on it.