I'm still looking at this.Could you show me how that would be wired?
I have also attached a pic of the circuit layout complete with the PHAT tracings. Let me know if the layout is correct?
Are you going to attempt to make this board yourself?
You'll need 2 Oz/ft^2 copper minimum.
R4 will have to be a trace on the board, not a physical resistor.
An 0.4" (400 mil) wide trace 3.1" long of 2oz/ft^2 copper will have a resistance of 2.01 milliOhms, which will be just about right for this. A careful layout will minimize parasitics. I guess you need someone to do that for you, as the software you're using just isn't as capable as the Eagle Layout Editor.
I'll look at it when I have a bit of time.