For the wallpaper, I simply decoupaged scrappbooking paper to each “room.”  Quick and easy.

 

 

 For the roof, I took scrap pieces of 1/4″ plywood cut into 5″ strips and cut scallops out with a jigsaw (just use a small round object to create your pattern with) and nailed the strips down.

 

 

For the stairs, I simply cut 19 1x2s to the width of the stairs, and glued and nailed them on top of each other.  Couldn’t think of an easier way to do that!