Glass Guys are professional window cleaners and treaters. If you were to ask them in person about window treatment ideas they should be able to give you some options or ideas that would suit your needs. They also have a 100% guarantee if you are not satisfied with their work.
If you want to find information about broken auto glass repair, I would suggest you go to Dave's Automobile Repair Shop. They have really good deals on window repair and can fix any window you give them.
Many window treatment services will be local businesses near your residence, that can be located using your yellow pages in the phone directory. Some national chain stores, such as Lowes and Home Depot, would have information available on such services.
Any window treatment that blocks out overhead light would work great in a loft.
MIRROR
tinted glass
A window viper would be the your answer !
Window glass is brittle.
If you have a broken or chipped windshield. I would recommend going to the Glass Doctors. They are a great company and are located in both the U.S. and Canada.
A window etch kit would include acid, a corrosive material, to etch the glass.
Eleuthera
A commercial glass door would be purchased from a window replacement, or window repair compnay. Where to buy depends on where you live, and where there are local companies near you.
Transparent (: