angled plane for guitar

I'm trying to create an angled plane on a guitar.
The area in black is were the angled plane is
The curved black line in the half circle is where the taper starts and tapers down .75 to the middle of the straight part of the half circle.
I did this 4years ago but can't remember how I did it:o
I've tried the angle plane but am not getting the results I'm looking for

Brian

Try a 2-rail sweep with your desired angled cross section 'up on a chair' to get the correct Z height. Your rails will be each half of the outlined black area.

-B

Thanks Brady
I'll try to remember it this time

Brian