5 or 6 seat Robbie, sounds like a BIG piston engine to lift that ! I think the 206B3 and EC120 fit nicely into that market already, so Frank has some stiff competition awaiting him. What's the going rate on a used 206? 300 K USD?
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Randy, bring that "New" OH-58D turned Bell 40? JetRanger IV out here and I'd volunteer to do some altitude testing !
One problem with the concept is the Blades, a 206 will fit into a very narrow hangar, but a 4 bladed system eats hangar space faster than a pilot eats at a Rib BBQ !