Also wanted to mention something else on the to-do list.  As this controller deals with live household current, it should definitely be contained in an enclosure when in use.  So, in addition to what I am already working on, once I have the PCB design finalized, I will also design a 3D printable enclosure.  As I already have a 3D printer, this makes more sense than trying to fit the assembly into a stock project enclosure.