Do not cut or etch/engrave any material that might have chlorine. You can check by heating a copper wire in a flame, touching the material, and then reheating the copper wire. If the flame emits a green colour then there is chlorine in the material. See Beilstein Test and a video demonstration.
Boxes.py: https://www.festi.info/boxes.py/ provides configurable boxes, shelves, drawer insert, and more, and outputs laser-appropriate files to use.
Live Hinges: there is a resource file on Google Drive containing examples of various live hinges possible with a laser cutter.
Nesting: https://deepnest.io/ provides open-source nesting software for optimized part layouts.