Here is a practical problem. Insurance. The stranger it is, the less chance you will get insurance on it. You will have to self insure. Self insuring a $20,000 airplane is not that big a loss. Hurts, but it better not be changing your life stile loosing the money; you are not suppose to be spending rent money on a toy. $200,000 airplane and even a multi millionaire will say bad investment. A friend of a friend just got a Seawind; thumbs up all around. No one will insure him in it. Airline captain maybe, but no 500 hr Cessna Piper driver. Now he has a plane he can't fly because of money risk. A friend putting his VK30 together probably will not have insurance except liability. He is a retired airline captain but has not flown in eight years. Its a 200K project that may or may not be worth something in the end. There was another VK30 at the airport that was a total loss when the engine quit on takeoff; no one hurt but it was self insured because not insurable and a turbine. By by a couple of hundred grand.