Or you could wait a few months and let him get one of the new foamy F-4’s that are rumored to be in research/development. Freewing has been hounded for a couple of years to put out an 80mm Twin one. of course, they’re silent but the outcry is deafening among the EDF fliers. Same setup as their highly successful A-10. The entire pkg would probably be much cheaper and fly much better than the conversion