Retrolefty, thanks that looks very accessible.
Jack, that's a big help and an interesting read. I need to sit down some time and figure out DC/AC coupling/decoupling. They use a lot of capacitors.
They are using CTs. I was hoping to avoid CTs and try to directly use a shunt resistor since CTs seems "too easy". I think some of what is in here though will help quite a bit.
Thanks again!