This is a great writeup. I find no issues, and you include some things that I learned the hard way. For example, creating the model with Z up and X and Y matching how I want to mount my stock on my CNC.
There are two things you should consider adding. First, providing a link to the FlyFisher post processor might be helpful. Just something like, “If your machine is running Marlin, the recommended post processor can be found here.”
Second, I’d add an optional but highly recommended step of simulating the job. Given how often I have problems (and the overall complexity of Fusion 360 CAM), I’d never postprocess before I’ve simulated the job.
As a side note for you to consider, the facing tool path is the only one that benefits by setting up the stock to be thicker than the model, and thicker stock can cause problems with other tool paths. Typically, I setup the stock as Relative Sized Box with No Additional Stock. Personally, to keep everything standardized, I even do this for facing operations.