How did you do this, Lowell?

I bought my "Mangy Fox" as a project (it was certificated E-AB). I have rebuilt it far further than the original builder did the original kit. I'd love to reregister it using "built from parts" as a new experimental plane. Even as a "Mangy Mark I" if I had to.

BUT-- I don't have receipts for the "parts" used to assemble it. (Sales tax issue, too...)