what's the world's biggest circuit/motherboard?

This winter I'd like to try and build the RE Robot Brain board (80188) that appeared in Radio Electronics contemporary with the 68k articles. I have on hand an approximately 4' x 2.5' sheet of double clad circuit material, and I could cut the size I needed from that. But it got me to thinking (uh oh). Wouldn't it be fun to build a REALLY big motherboard. You could put all sorts of uP's on it, ala the Dimension 68000. You could put the kitchen sink on it (literally). More then likely you could build something so powerful, you could throw out your Terragigahertz Pentium whatever system, and heat your home at the same time. And probably the surrounding neighbors home's too. You might even cripple the power grid. It would be like sort of a black hole for electrons. Has anyone built a really big motherboard? __________________________________ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com