As an engine core, it is only intended to be a starting point to then heap time, knowledge and materials on in order to eventually produce a worthy, reliable, flight engine. Sometimes a real Cinderella story. It helps that I have spent 30+ years in the aircraft engine game ( turbine repair, overhaul and test ) and been an auto / skiboat builder along the way, having built a fair few VW's and Chev's. It's not going to be a quick build, but will be very slow, thorough blueprinting, but I enjoy that stuff.
Russell