Operational report!!
I wasn't sure about the angle in comparison to the bottom of the bucket, so I made it a few degrees forward of perpendicular, so as long as I maintain the bucket flat the ripper is slightly angled forward. I like that aspect, I cuts roots real nice and does pretty good on the frost although I need to put a sharper tooth on it. It really is nice for cutting roots between real close trees, that's too narrow for the bucket. Overall very happy, an afternoon and some scrap is all that it cost.