Here are some drawings of a basic wall cabinet built using pocket screw construction. All joints are butt joints. No dadoes required.
By keeping the dimensions slightly less than 24 inches wide, the use of plywood is better utilized. Build as many as you like.
The cabinet is 23 1/2 inches wide x 30 inches tall. When assembling the cabinet, drill the pocket holes so they won't be seen (on the top, from the back, from underneath.
Assemble the face frame first using the same pocket screw construction (and a little glue if you like, but it isn't really necessary).
I also included plans for using a French cleat system. Mount a board on the wall with an angle cut to match the one on the cabinet. Simply lift the cabinet just enough so the two cleats clear, then lower the cabinet onto the wall cleat. The bottom spacer will make the cabinet sit properly. With that said, make sure the wall cleat and the cleat on the back of the cabinet are mounted so you have clearance to hang the cabinet. If the ceiling is high enough, the mounting position may not be of concern.
After mounting the cabinet, I ran a couple of 3 inch screws through the back cleat into the wall studs just to make sure the cabinet stayed put.
I hope you like this and find it useful. Let me know if you have any questions.
Check out this video by Kreg. The guy builds a cabinet similar to the one I have drawn. https://www.youtube.com/watch?v=jYdC...FE527DE2F3221A
Note: I included a few pictures of cabinets I built for my garage/shop. They are not exactly built as the plans indicate, but they are similar and use the French cleat system to mount on the wall.