So today the Red case arrived, and I cut the front panel to fix the LCD in it.
I also cut a copper PCB to slide into this case to mount all the hardware.
I don't know when the Power Meter device from Minicircuits will arrive yet. That's kind of core to this :-) So that part is on hold, but I expect it'll be here this week sometime.
I also found a nifty Arduino Nano "Terminal Adapter" that I'll be using to connect up all the wires to it. See this link.