This started with some 4x6" (10.16x15.24 cm) acrylic sheets I got at the dollar tree, they are about 1/8th" (2.8mm) thick. I wanted some display cases for figurines and stuff I have printed. The fusion files have been included so anyone can remix for exactly how you need it, I did separate exports for 6" wide and 4" wide so that the depth can easily be adjusted by moving the back wall in the base sketch and the lid will also change.