You might want to strengthen those mitered corners with some splines. A couple of ways to do it, and here are pictures that are self explanatory. And the jig to cut them for your box is ultra simple to make. Note how simple the table saw setup is. You can cut splines on your router table as well. Splines add great strength to any box, and if you use a contrasting wood, they can be decorative. I use them all the time in picture frames. You can even make them with a dovetail bit for a strong, but simple dovetail look. Cool, huh?
I make them often enough so I made the fancy jig you see in the middle picture. Very adjustable, a tall divider so I can clamp frame pieces to it, and kind of overkill. A wood strip underneath slides in the miter slot. I use a fine Japanese pull saw to cut off any excess, then sand perfectly smooth. My jig has the blue T track for positioning the spline and blade. The blade always comes through the same slot. If you use the table saw method, you just need to set the blade to an exact 45 degrees to cut both the mitered corners, then to cut the slot for the spline. You do need to make certain the workpiece is exactly 90 to the blade. But cutting with a 45 degree bit is just as good.
A full kerf blade is exactly 1/8th inch wide, so that will also be the thickness of your spline. Glue is so strong the wood will break before the glue fails. Stick turned me on to splines many years ago, so much easier than other methods.
The more I do, the less I accomplish.
Last edited by DesertRatTom; 02-16-2020 at 12:07 AM.