They have been selling blades for a long time. After a first failed attempt to build wood blades, i almost bought a set of 13' diameter from them. They were a very high tip speed ratio, and i didn't think they would work for me, so i tried again and made wood ones.
The hub looks too light and small to my eye, but you could always beef that up.
CMS magnetics is the seller, and that's where i got the magnets for mine. Very nice packaging, good communication etc.