I recently discovered the Rotor Riot Kwad Box, but im not much into miniquads, as i love planes instead. I think that FT should do something similar with planes. I think that would be extremely popular.
I gotta say, I love the idea of this Coroplast Sailplane Box!
It's a different sort of animal than the Kwad Box though. I did the Kwad Box for a while but I'm just not into quads enough to use the props at the speed they were coming. Plus I had a parting of ways with Rotor Riot over their enablement of very bad community behavior.
But yeah, a FT scratch build subscription program would be neat. I've been a member of the http://BalsaBuilder.com subscription since it started and love it!