Wiring Diagram for sim racing Button Box - Project Guidance

This is somewhat of a cross post from SimHub. I hope that’s okay here as this is my first post and first time using an arduino. I recently purchased quite a few electronics from AliExpress to build a button box for my sim racing rig but I am having a hard time, however, making sense of the wiring. The button box I'm trying to build is based on this one and will have 15 2-post buttons, 1 NO/NC/C button, 7 2-way 3-post toggle switches and 7 rotary encoders that have CLK, DT, SW, + and GND pins. I

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