21st Century Toys does indeed offer both a 1/32 and a 1/18th scale line of aircraft.
At 1/18th, the aircraft are big. I have a couple of the P-47s, and (from memory-I'm sitting at work now) they're around 2 feet long, with a wingspan close to 3 feet, perhaps?
You need a lot of horizontal space to display them, or a lot of headroom and a sturdier system than thumbtacks and fishing line, to make a ceiling display. But they make impressive models. And if I had kids, I would get them those planes, as toys, to get them interested in history, and ultimately, the hobby.
The models can be bashed into decent-looking display models, too. I've seen guys who detail them, repaint them or just weather them.
Prost!
Brad