I am buying a home that has solid steel Bilko doors going from the basement to the backyard. There is also a small window in the basement that provides only little light. However, when I open the bilko doors, a whole lot of sunlight shines into the basement. Does anybody know of transparent replacement doors for the Bilko system, or a different alternative which would allow the sun to shine in through that portal, and even make this a viable entrance to the house?