Desktop paper notes box organizer

Cut out the parts. Since there is a flexible element you must use a soft wood.

The profile doesn't include an additional bottom cover, but if you wish, just cut an additional bottom part without the holes.

Glue the two top pieces together. Clamp them until the glue cures.

I suggest you rotate them so that any burn marks are hidden.

Apply glue to the bottom part as in the picture. You can also apply it to the wall where it will join the bottom part.

Add the wall part to the bottom part. Make sure you orient it correctly. The cutout on the bottom part opposite of the two cutouts is for the middle of the wall part. See the 2nd picture for help.

I started in the middle and worked my way to the front from both sides. Once the wall is inserted, firmly press to ensure good contact.

The wall will hold its shape quite well. Add the top bracket as shown in the picture. 

I suggest you apply some weight on the top until the glue cures. This will ensure everything is held nicely together.

Remove any excess glue.

Optionally, you can paint or stain the part for a nice finished look.