I would be interested in any advice you have on putting a window into an internal door to bring light into a dark hallway. The door is a 44mm flush veneer(1/2Hr FC) The things I'm concerned about are... How big can I make the opening without introducing too much flex in the door? Its a pretty heavy door (50Kg approx) so I's guess this is solid mdf? I'm considering a long narrow window (about 6 inches wide) up the centre of the door. Should I move this closer to the handle side of the door? Thinking of finishing this in Stainless steel or aluminium. Could I take it that an appropriate engineering works would be able to knock a frame out for a reasonable cost? (approx £50)
TIA Sean