The next step with my model room was to install the window. I started by making the window sill out of a strip of corrugated card which I painted and cut strips out of to give the impression of individual tiles.
Then I cut two window frames out of thick white card and glued a rectangle of acetate between them. I then stuck this in the space.
I made the handles on the windows out of silver paper and card, and cut lines into window frame to show the individual windows.