From what I understand the standard engines for Kitfoxes are the Rotax four-cylinder four-strokes, the Rotec, different Lycomings and Continentals, the Titan and the Jabiru 3300. If one chooses one of these engines then I presume that the necessary parts, such as engine mounts and cowlings, are easily available. I was wondering whether it would be about as easy/difficult to install instead an engine by D-Motor or ULPower or an automotive derived engine like a Corvair or a VW derived engine or an engine by Aero Momentum, by Firewall Forward (CAM) or by Viking, or, if available, by a Subaru derived engine.