Note that "building" is used in a loose sense: the transistors and wires are simulated. It sounds good anyway. It would be interesting to compare this to the

Note that "building" is used in a loose sense: the transistors and wires are simulated. It sounds good anyway. It would be interesting to compare this to the last chapter of SICP, which also builds a simulated computer and compiler. Around 1980, the authors swapped their typewriters for soldering irons and built it for real.