My son saw this project and wanted a rocketship. I was also tired of piling up his books on the floor. The only wood I bought for it was 1/4" ply for the back as I used leftover 3/4" plywood for the bookcase itself. Fairly easy with a Kreg, it just took a little while to finish all of the painting.
And of course, Zinsser Bullseye primer.