Use around 9 vertical walls or it will break if you bump it to hard.  *Customizable cad found here with free onshape account https://cad.onshape.com/documents/642e4d2b06f7b9bfea037d55/w/9f02e555b021b15424279ae9/e/128eed720553efd895f999b2 feel free to customize it as of now it uses a couple wood screws and a board with dimensions of 0.75in by 2.73 in so maybe a 1 by 3? its scrap wood. Duct tape is due to me not having the correct size woodscrews so used a self tapping metal screw.