Okay, let's start with the mike side. This is okay assuming that by 'sleve' you mean the small ring connection, just behind the tip, on the male plug. As already pointed out, 'up' will be #2. Flip the #1 and 2 connections if you want up to be #1. Also, the jack must be fastened to a good ground. Best practice is to insulate the jack and run a ground wire to your single point ground buss, but for a simple set up like this, just ground it to the metal frame and don't worry about noise.
Now the headphone side, this is wrong. You have a few options:
1. If you use stereo headphones, wire it as you show, with one radio going to the tip terminal, the other to the ring terminal. Ground the jack. You will hear one radio in one ear, the other in the other! Use the volume control to turn down the one you don't want.
2. Mono headphones. If you never want to monitor both radios at the same time, run the two radio outputs to the third pair of connections on your switch, exactly like the mike connections. Run a wire from the center terminal to the jack, ground the other side.
3. Mono headphones. If you do want to monitor both radios, wire it as shown but use the mixer. The single output goes to the headphone jack, ground the other side. Use volume controls to set levels. Note mixer has just one output, you also will need to supply ground and 12 volts to the mixer.