I emailed James regarding my engine selection. His response is below:

"Actually our F-18F will be very strong for people who use JetCat P-180 or P-200. If you have 51 lb turbine, it is OK too. You do not have
to worry about this point. "

You may want to contact James if you will be using an engine with less power than is produced by a P-180 or AMT Olympus. The plane will be built lighter for less powerful engines.