Sized to fit on the 2-Story Room Box French Quarter (it sits in a bit from the edge of the flat roof, to allow room for trim like the fencing on Laura Carson's artwork below, so is approx. 11-1/4" wide x 9" deep at the base).
Laser-cut heavy chipboard. Ships flat but a breeze to put together with the slots and tabs precut (you'll just need to secure with a bit of white glue).
Note: Items cut from this heavy, light-grey chipboard burn easily so the laser-cutting process may leave charcoal residue behind. Save yourself a headache, and just wipe the cut edges of these items down with a dry paper towel before assembling or painting.
Design Team Member Laura Carson made a Steamtown House (see the wide photo below). More info in the blog and/or see the supply list.