A 412 would be easy, only need a four bladed rotor system but the UH-1Y is a whole nother animal! Plug behind the pilots to stretch the cargo area, top dog house and engine cowls, new tail boom too! We can only hope someone will come out with a new kit one of these days! We could use a new production AH-1Z. The whole drive train, powerplants, rotors and tail boom are common to the UH-1Y.