And yes they really are performance bargains. I expect £600 quid maybe for the bonnet, maybe more for the roof? Then 1k on a mondial warranty. It would cost you a few k to change from your car.
You've got a v nice spec on yours, probably quite ballistic, just cure the temptation by sending it to birds for the LSD. Think of the money you will save doing that instead of parting on the m5