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George, what an opportunity to contribute to something so interesting. I rode in a Ford Tri-Motor a few years back when the Experimentail Aircraft Associaton was giving rides here in Indy. It was the most enjoyable airplane ride I've ever taken.Incidentally, I just checked, and the EAA is booking rides on their Ford 5-AT-B for August 3-7 in Port Clinton.For those who might be interested, here's the itinerary for the whole summer:https://www.eaa.org/en/eaa/flight-experiences/fly-the-ford-eaa-ford-tri-motor-airplane-tour/ford-tri-motor-tour-stops--Tim
I don't know the regs in USA, but in New Zealand, TVAL, The Vintage Aviator Ltd at Hood aerodrome Masterton builds WW1 aircraft, German and British, and if require through lack of parts build every thing from the prop to the tail skid, and wing tip to wing tip, engine, instruments, machine gun and all. Some of the aircraft have been/are in UK and France at the moment during the centenary of WW1, flying at airshows, and over the battle fields.Ian S C