Step 1: The Parts
A normally off button (Rated for at least 120v 15 amps)
A Switch (Rated for at least 120v 15 amps)
As many outlets as you want
A power cord
Wire (Rated for at least 120v 15 amps)
Things to hold everything together (screws, bolts, etc...)
A fuse rated around 120v 15 amps
Or you could use a circuit breaker rated for as much as you want it to trip as so you don't trip one on the main grid
Step 2: Tools
Step 3: Get Ready to Cut
Step 4: Cut All the Pieces Out
Step 5: Sand the Edges and Drill the Holes
If you happen to have sandpaper you can sand down the edges of all the holes to make it nicer looking.
Step 6: SCREW EVERYTHING
Step 7: Wire Everything Togerther
One wire from the power cord goes to the switch, the other part of the switch goes to the button, which goes to one side of both outlets, the other side of both outlets goes to the fuse/circuit breaker which then returns to other wire in the power cord. The GREEN wire from the power cord goes to the green screw on the outlets, it doesn't go anywhere else.
In the photos I have attached both the fuse and circuit breaker in parallel, so don't let that confuse you if you only use one.