Post Whore In Training
In the FPD file, the bits highlighted in red are the main (e.g. non-hat) I/O connection holes for the CM4. Everything else is up to how you configure (for example the round connector on the upper right-hand side was for a mini XLR connector used to power the Isolator 2 + HiFiBerry Digi+PRO from an external 5V LPS).Thank you.
My internals will look similar with what I use to have, for sure not a hat.
I am not sure if I will add a LPS or not. For now, I am using a medical SPS for 12v input, works fine.
The height was for 11mm standoffs (if I'm remembering correctly) above the bottom panel, which was flush with the bottom edge of the back panel.