Provide a step-by-step guide

[LukeMarlin]

Would it be possible to provide a step-by-step guide on how to build the key?
Links to buy the components, required tools, and how-tos?

[emosenkis]

I put together this shopping cart on Digikey for the Solo Tap C v2.1:
https://www.digikey.com/short/pd8385

@conorpp would you be willing to give this a quick look and confirm if everything here looks right?