Hi Jeff, Ok I've attached here a model file with things set up for history editing as I described above.

This is set up with an angled cplane but only in the 3D view, the top/front/right views are still oriented with the world axis.

I made a curve and extruded it to form the sloped piece, then intersected that with the vertical plane to make the magenta intersection curve. Then I enabled history updates on that magenta curve and then hid the vertical plane to kind of get it out of the way.

So now your job is to select the base curve of the extrusion which is this one:



Then adjust those control points and while you are adjusting them watch the magenta curve in the Right-side view here:



That magenta curve will show you the section that you want to have match with your blueprint.

You can adjust the points vertically in either the 3D view or the Right-side view but if you want to move them left or right you need to make that kind of adjustment in the 3D view since it has the cplane set to the same plane of the curve - remember that extrusion base curve is set at an angle and so you don't want to go move any of its control points in the ortho views other than in the world z axis direction.


Hope this helps to get your sloped piece set up properly!

- Michael