The plastic is Lexan. (Polycarbonite). It is really great stuff. Much stronger than acrylic (plexiglas). So far the plastic weighs about 9 pounds. The battery is 4. I am hoping to keep the whole set up under 20 pounds. I would like to lose another 20 pounds off my belly over the winter so we would be even.
As far as wind goes. The Seattle area is not very windy. It really isn't. My design is intended to minimize the side profile so a side wind (or truck) won't knock me off track.
I have only done a limited amount of riding. I need to do more testing before I make a full commute.