I am looking for an inexpensive way to make 3 old sash windows (60 inches x 47 inches) safer in a rehearsal room. I am wondering if we could use some sort of acrylic to cover them so we don’t lose light but if a child was to trip and fall against one they wouldn’t go through it. I priced polycarbonate and its way out of our budget. I really don’t want to board them up! Does anyone have any ideas?