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.