For those who enjoy altering books here is an idea for the cover. In the book below I used a dollhouse door. First I painted and distress the door. Next I cut a hole in the cover and a hole in several pages of the book (the depth of the door insert). Then I glued all of the cut pages together and glued the cover to the pages. Finally I Insert the door in the hole and glue it in place.
I use all kinds of dollhouse architectural and hardware items in my collage pieces. They usually come unfinished so you can alter them anyway you like. Some craft stores carry dollhouse supplies and there are several online suppliers. I’ve also purchased items on eBay.