No you don't have to use the donor car engine.
But it could be easier to use it and change it after the IVA.
depending on what engine you are intending to use.
The VIN number usualy is 17 numbers and letters.
You can use your own made up one, but some DVLA offices don't like it.
I used my own numbers, made up from my birth date and the date I finished the build
David
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