Magnum head porting for the beginner

its a rhetorical question.

Thank you J.Rob
..mainly the grinding part. The intention was to rely upon your local machine shop would give you.
But I also wanted to illustrate the importance of the top angle (larger diameter stone)just to make the point. When a Serdi is used, a second cut would have to be performed to get the width, but it would be a 90°. But, I'm sure you're well aware of that :)
Thanks for the input !