I needed some help with squaring box frames during glue up. Could have bought some small squares for the project but I have a laser, so laser the stuff.
The small L squares can be used on the outside as well as the inside for alignment.
If you can use these, have fun, for your own use only.
Note the tab slots are just a little loose, they are sized at 3.5mm my material measured 3.47mm-3.49mm, did not feel like beating stuff to fit. Glue makes it work.
Once again I used Affinity Designer to make the file, PDF is 508mm x 304.8mm (12"x20") saved as 96 DPI, Glowforge colors, for your use if you want to open the file in another design app.
Have fun John