Using a Written-off kitcar as a donor?...

[Dino Builder]

Hi guys,
A possible situation has presented itself in the shape of a written-off kit car which, if used as a donor for a new (identical) kit:

1) Assuming the donor kit car had an age-related plate, would the new kit be awarded an age related plate also? i.e. if the donor was correctly registered, would it be the same as using any other donor?

Or, would there be a greater likelihood of being awarded a 'Q' plate? (Due to ambiguity of origin of the engine/box & other components?

If the donor is cat 'C', I won't get a V5 document. Does this make a difference?

Any ideas? Thanks. - Glenn.