Anyone know anything about folding glass walls? I have a 6'4" opening into my sunroom that I would like to close up during the winter, but still let light in. I can't put a regular set of 3'0 french doors in because when in the open position they interfere with traffic flow. This opening used to be a bay window so there is a 2' niche on either side of the opening that I could fold the doors into if they were on a track of some sort. But I have absolutely no idea about cost for such a thing. Anyone?