the biggest mistake made with the flypast a/c was putting it on the uk register under current caa policy anyone with a twin or even large single needs to have their head read if they stay with the CAA.
I have flown the b206 N181WW many times and have helped maintain it for many years so know the enormity of the work involved in keeping it airworthy if you then have to maintain it according to CAA requirements it would be far cheaper to operate a small airliner.
However I know of two large sources of spare parts. engine parts are easy, series 1 props are rarer than hens teeth but there are only 2 new and 1 damaged in existance, hence the us plane which has been for sale for some years.