It was built from open source kit and cheap hardware by a security penetration tester who wanted to make his love of wardriving more nimble.
The plans are detailed in a diagram and a video."
Link to Original Source
"And do you think (fop that I am) that I could be the Scarlet Pumpernickel?" -- Looney Tunes, The Scarlet Pumpernickel (1950, Chuck Jones)