I came close a few times but luck saved my arse every time...
One of the problems I faced was completely of my own making. I decided to lower the plate a little bit more into the handle as too much of it’s back was showing. If I had noticed that while doing the drawing I could have changed the template to reflect the change, but dummy here didn't notice it until the handle had been cut out, half shaped and the plate’s mounting slot cut into it. If you look above the screw studs you will see that I didn’t quite get the front hole right and the result is the plate is aiming downwards a bit. It is an easy fix, thank goodness. All I will have to do is adjust the top of the handle to match the angle of the plate. It will work, but it still bugs me.
I have now pulled the plate from the handle again so I can do a lot more sanding - not my favourite sport.