I have discovered a great website that creates the drawings for any box size you input.
It creates a fully finger joint box for you.
You can then finalize the files, including adding some engravings to your box, and then cut it on our Trotec laser*.
You need to tweak the files a bit, but it saves hours of work in a drawing program.
*You must take our laser workshop before using the laser.
Here is the Make A Box link… https://boxdesigner.connectionlab.org/
Here is our upcoming workshops… https://iweb.langara.bc.ca/makerspace/signup