The rules include a question reading period with no timeout to reading the question. During this period, any player who tries to ring in receives a 250 ms penalty. When the question is finished, players have a five second window to ring in and a five second timeout to answer. After an answer timeout or a wrong answer, there is another five second window to ring in and the flow proceeds until a player answers correctly or all players have rung in and have answered incorrectly or the ring-in window has timed out.
Initially, I built my project on a solder-less breadboard. When I got the connections worked out I moved to a Radio Shack Universal Component PC Board with 780 Holes which I happened to have bought several years ago. My intention was to use as much from my junk box as possible. I recommend that, if you plan to make this, you consider using the MakerShield Kit from Maker Shed. It is more expensive but it will have the parts you need and save time.
I have not included a lot of detailed instructions on wiring the PC board, since I don't recommend that you use the same board as I did and the circuit is fairly simple. The circuit and the breadboard layout are included.