First off, we need to get together our supplies.
You will need these tools:
"Helping Hand" holder
Hot glue gun
Rotary tool with cone grinding bit
Needle Nose Pliers
The supplies are as follows:
3x female 3.5mm stereo panel mount audio jacks
1x DPDT toggle switch
3 male to male 3.5mm cables, or whatever 3.5mm cables you plan on using (male to female, male to RCA, etc)
and, of course, LEGOS!
Strip about 1/4" to 1/2" of each end of the wire lengths.
Put the stripped bit of wire through the proper hole, and bend it over on itself using the needle nose pliers or your fingers.
To save yourself the frustration, use the Helping Hands to hold the jack and wires in place while you solder the wires to the connections.
For my connections, I used green wire for the ground, red wire for the right connection, and black for the left connection.