Step 1: Scrounge up some Material
Cardboard Enough to surround your laptop...and then some. Any box big enough should do.
Duct Tape The Force that holds the universe together...in any color(s) of your choice.
Foam Packing Sheet This will be used for the padding...bubblewrap might also work if done carefully.
And you'll probably want these tools too:
Razor/Box Cutter For cutting the cardboard...not your fingers.
Yard Stick Very useful for measuring things, though you could make due with a 12" scale.
Marking Implement Pen, Pencil, Marker, Quill, Charcoal Stick, etc.
Note: Scissors could probably be used in place of the Box Cutter
Oh, and a Laptop of some sort to put in when your finished...
(Sorry for the fuzzy pictures...I didn't find the 'Steadyshot' feature on the camera till later)