Step 8: Glue the first side part to the bottom
Now the glue is dried, we can start to glue the main frame together. The backside gives us some kind of support for this, because we want to have a box with 90° angles. Everything else will look like rubbish.
Get all the parts ready and start adding glue to the bottom part and the edge of the side part. Let it dry a few minutes then get it together. Do this in the upright position, with the front side down.
Now adjust the two parts, that the edges are really smooth and then put the backside on top. Drill through the first hole of the back side a little bit into the side part. You remember, the screws had 2.5mm and the drill is only 2mm, so there is enough wood retained to give a good strength.
Fix the back with the two outer screws to the side plane. Then continue with the bottom part and also screw the back to the bottom part. Make sure the parts don't move while screwing!
Now you can carefully lay it on the bottom and start screwing the inner rectangular block of wood to the bottom.
The back side, fixed with 4 screws, makes sure that we really maintain a right angle between the two parts.