I'm one of the people involved in the project, and can answer some of your questions.
We are building only one. Tim Oconnor has two under construction, though it's not clear when they might be done, as he has a way to go yet. There's at least one being built for static display.
As far as flight readiness, we did a bunch of prep several weeks ago, decided the plane was ready to go, and brought in a test pilot (Dave Morss). He did assorted tests, up to high speed taxi, then we had a brake problem, which ended up causing us to rebuild the brake calipers and master cylinder. We fixed a couple other things while it was down, and it's now ready to go again. We're waiting on Dave's availability resume the testing. That will probably happen in 2-3 weeks. We expect that this time we'll get some real air time on it.
You can see some amount of pix and vids at
www.mayocraft.com . There's also a pictorial history of construction, with other vids, if anybody cares, PM me for the URL, as I don't want to melt my server
The plane is for sale