RE: One wing or two
The last thing I want to do is reinforce Arch's point. So let me say this, if you could bring a decent pattern type bipe to market for around $300 I think you would find buyers for it. The reality is that at local contests the planes don't get weighed so if it was a little over weight no big deal, but the purchaser couldn't take it to the NATS.
Like I said earlier, I have an affinity for bipes so a reasonable price on a pattern type bipe would probaly get me interested in having it just to play with....it would be the curiosity factor.