Working on the second cabinet door and changed the design a bit to accept the inserts much easier and more professional looking. The first door did not have a groove cut so that I could just slide the inserts in. This second door does have the grooves and in my opinion look a hell of a lot better. I may go back and re-do the first door or just replace it. Here are a couple of shots of the new door to help better explain. Since the groove is cut you can only glue the 3 sides of the cabinet together at this time so I need to finish the inserts and stain the inside of the cabinet because once you add the insert and the fourth piece it is in there for good. These doors have not been sanded yet so they look a lot rougher than they will after sanding and staining.
Here you can see the groove cut along the inside of the door.
The top of the piece has a biscuit joint cut in it so it looks like the grooves are cut really deep in the wood but this is not the case it is less than 1/4" deep.
Inserts installed to check the depth.
Here is how the inserts slide in, once they are finished I will slide them in just like this and then add the fourth and final piece to the door with biscuit joints and glue.
This is just to checks the inserts fit nice and snug when it is all together. the door is not 100% assembled yet.