Box Maker is a useful little site that creates finger jointed box designs. Just input the dimensions and it spits out a pdf with each side jointed to interlock. Then just convert to SVG, laser cut, and glue it together! I started out making small arduino enclosures, but soon learned that with a few modifications the boxes could be made to have a functional top. Since then, I’ve made boxes in various sizes. The fun part is picking a design to etch into the top.