They're probably Ada's, to be honest.
I've just ordered three circuit boards for the initial prototype for testing/sizing, for what it's worth. $12.14 for three with tax and shipping. I'd call that a deal.
Shouldn't the diode in the circuit diagram pointing in the other direction?
No, it's correct the way it is. When the relay is switched off, the coil inside creates a current that is opposite the former current, so the voltage is also is reverse. To protect the semiconductors (here the transistor), this voltage is shortened by the diode.
Saved by the diode. (yay)