If you are building a Sonex, or are simply interested in the design, then a visit to www.wheelsup.org is certainly a good idea. Well, if you're building one, I would have to assume you've been there, but if you are interested, then maybe not. ;)

Ok, and if you've never heard of a Sonex before, and would want to know what one is, then you should probably go here first, then maybe head over to the other site if you're interested.