Gutted for you to go through all of this.. Could you not take it a specialist to get it diagnosed and rectified properly and get them to foot the bill?
or ask for a partial refund due to the fault and be done with them. as its such a nice tidy example seems a shame, money spent with a specialist to rectify would be well spent as its only going to go North in value,
I know a guy who has an ex prodrive gearbox builder working for him 1 day a week
Hope it all gets sorted and you somehow manage to keep her.