The problem is, it’s for lasers (and the ads are obnoxious)
A rabbeted box is far easier, so much so it’s described as “The Simple Box”:
Alternately, there is:
(where the ads are at least a bit less intrusive)
which is written up a bit at:
That said, I believe a better approach is:
as written up at:
Working on simplifying that further, and I believe I finally have a tool which will allow a perfect form of joinery…
That said, if you’ll let us know what sort of box you wish to make, its dimensions, and the thickness of your stock and any features you want, we’ll walk through making a box with you here.