Hi all, in in the airpark home we are buying, our hangar is open-front (no doors). I like the open-front look, but really need a door, so we will be looking for some kind of door. My my question is, in an effort to keep the door light, rigid, and inexpensive, what does everyone think about making a bi-fold door out of fully-wrapped foam and fiberglass sandwich panels (upper and lower panels)? can it be done and be rigid enough across a 42' span as long as the middle is supported by cables? there's a 'twist' to my story which I will offer later, but I first want to know if this approach could work for a rectangular opening. Thanks in advance, Bruce NOTE: OK, I'll admit that I could do some of my own calculations, but I'm being lazy (saving energy for putting up the door later).