Airframes
Benevolens Magister
Get the 'advertising' right, and there'd be a market, though small, as a part-time business. With the selling price realistic and reasonably affordable, sales could 'go' via flying clubs, aviation museums, maybe even Air Force personnel and so forth. You'd need to get a basic pattern that could be adapted to fit most types, maybe two or three basic structure plans, that could all be built in modular form, then finished as the required aircraft. That would keep the cost and lead-time down, and give a realistic profit. I'm thinking a structure for radial engines, say Corsair, FW190, Zero, and an in-line, eg Spit Bf109, Mustang etc., plus others, including more modern jets. Maybe a very small, niche market, but, say, two to six a year, could make a nice little earner on the side. Some years ago, a guy here in the UK did it with tanks, jeeps and cars for kiddies; sold well, and I think one of the 'big boys' bought up some of his designs, to be made in moulded ABS or GF or plastic; he started with a plywood Land Rover. You never know - worth a try if you find the time.