Questions on the KaupoiMOD PCB v4.1

New individual here with a couple of questions.

  1. I bought the KaupoiMOD PCB v4.1 board last year. Is this the current board and will it all still work with current software?
  2. Arduino Nano. Where is the best place to get it. I prefer but they seem to be out of stock. Is it still available and there is a variety of options. Nano 33 loT, Nano 33 BLE with headers, Nano 33 BLE Sense with headers. Which is it. I don’t really find one that just says rev 3.
  3. Is there a set of directions somewhere that describes how you populate the board. I have got the resistors, diodes, and relays on but am having trouble figuring out where all the stackable boards go and what is installed below them. The pictures I have found online don’t seem to match what I have.
  4. Any and all help would be greatly appreciated.

Have you read through this?

A lot of good info there.