40 pages of (at least) 160 g / m2 paper: That is twice as thick as normal paper. Colored would be a great thing, because the model itself has no color. This is the small room I leave for your creativity.
Glue, scissors, cutter: I use liquid glue (UHU) because it dries on colored paper in seconds, and I have another smaller pair of scissors, and some little pins and a tweezer to hold stuff together while it dries.
Cardboard: For the back. About 12" x 12". As thin as possible.
Wallpaper: For the great pop-out-effect. Same size as the cardboard.