Welcome to the forum.
You wouldn't be able to use the reg from any other vehicle as you aren't using the donor chassis. Crack on with what you have and IVA it. See if the previous owner has some build photos he can give you which will help come DVLA time (might even have photos of donor car if any). If the MK chassis has a chassis number supplied by MK then they should be able to help with purchase history I would have thought.
John
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