Way back when the Arduino started out, you could lay out a single sided through-hole design. People were encouraged to make their own. Then along came computers without serial ports and the need for everything to be USB, and suddenly you couldn't design an Arduino without a 4 dollar surface mount chip. By using an inexpensive through-hole USB chip (the PIC 18f14k50) we have created an Arduino-compatible board that most people can put together by themselves. Average completion time is between 1 and 2 hours.