Bike-engined - should I just scrap the donor?

[Renrut]

I'm finally making progress into what I originally planned about 2 years ago. I'm going ahead with a roadster inspired bike engined middy based on MR2 running gear. The donor is stripped of parts. The engine and parts I don't need have already been sold. Rest is in storage in the garage.

However I still have the shell sat on my driveway and my missus is getting annoyed by the rusty sight. Now I know I won't be able to get an age related plate because I won't be building it with the Donor's engine. So should I just scrap the shell off completely to save me worrying about the V5 and tax liability and register it as a completely amateur built thing? Or should I cut the VIN plates out, cut it up, weight it in and use the VIN plates anyway. And what photos, docs do I need if I go down either route?