You certainly dont need to puchase these components from amazon, you can find them on ebay or banggood or aliexpress as well. It's usually worth it to get a few of the same because it's easy to ruin them during prototyping.
1 5.08mm Pitch Screw Terminals 2 128 x 64 OLED 4 Perf Board 5 120v AC to 5v DC 6 Large Aluminum Knob 7 Rotary Encoder 8 Arduino Nano 11 2.54mm Pitch Screw Terminals
Besides the enclosure assembly, you will need suitable wire, various spade connectors and 2 quality 40A Relays. I've used 200ºC Temp resistant silicone wire for all lengths runnning inside the machine, 18AWG for the relays and 22AWG for the 5V signal wires.
You will also need to reroute the ground to the 3 way valve so that solenoid if you plan to have solenoid control independent of pump control like I do. Otherwise just piggyback the poles of the brew switch.
A wiring scheme for the Arduino and other parts.