We designed a nameplate for the front of the house to resemble the smokestack on the front of the Hogwarts Express. It is made of aluminum to be lightweight, and has a 1 1/2" rim around the outer edge. We attached 2x8's to the house and then attached the sign over top of them. We painted on the number and then added a few decorative rivets to complete the look.
Decal added to the window in the entry door is a dementor with the stag patronus
The metal Platform 9 3/4 sign is attached directly beside the entry door.