I saw this on display at the NYC maker and also asked about what it would take to run full speed. He said the gate capacitances of discrete MOSFETs are 100's of times greater than the tiny ones in a chip. This would require traces that could handle dozens of amps and a power supply for the whole board that could provide over 100 amps. So not really feasible - but then again, neither is building a circuit board to duplicate a chip