Thinking more about this PHD, the only thing I'm wondering about is the distance that the auger is from the end of the loader. Typically the gear box, motor and auger are as close to the SSQA plate as possible, and that's how my HD25 is.
Not saying that this will be an issue, but the further away it is the greater the stress on the loader connection points, and the lower the available downforce from the loader. If the auger binds up on a rock, root or similar, it's going to apply more stress to the loader. Just a thought and not trying to take anything away from this solution. Where I live, rocks are a constant challenge, but for many the ground is like sand.