It's been a few weeks since my last log post. Since then, I've done the following:

• Created SKiDL modules for each of the blocks shown in my last log post, except for the power section. I still haven't selected the voltage regulators for that.
• Wrote a blog post describing how to do parameterized SKiDL modules for LED circuits. This is also directly applicable to the switch and pushbutton sections of the CAT Board.
• Released a version update for SKiDL that includes improvements motivated by the need to simplify/condense the SKiDL description of the CAT Board.
• Merged the SKiDL-generated netlist for the CAT Board with my KiCad template for Rapsberry Pi HATs.

With regard to the last item on the list, here are the components and the HAT PCB boundary:

And here it is with the air-wires:

So I've got my crap. I've got my bag. Now it's a question of whether I can get all my crap in my bag.

The current state of the CAT Board is stored in the skidlized branch of the CAT Board repository.