Grugq has been working on this since -- 2012. He's had working code; it was just a problem of getting COTS hardware which would support it. Making custom hardware is a bad idea for this for a variety of reasons.

Grugq, Marc Rogers, and I have shown a (much more functional, actually secure) version of this, called PORTAL, at a couple conferences this summer, and will have a retail version on Amazon by December -- none of this presale BS.

Free downloads of the firmware for some of the most commonly available routers out there, and sold at cost ($20-25).