Hi Jeff,

> I guess if I'm not trying to reverse-engineer then it
> would be useful for defining my own curvature.

Yup, basically setting the cplane is an way for you to draw something in place at some angled position, it can relocate all the top/front/right views temporarily so that you can work in that local position as if that angled direction were the world axis directions, including even typing in coordinates relative to that temporary origin point.

But yeah, the reverse engineering aspect with sort of semi-incomplete information (you basically don't have the "plan" for that particular sloped piece if I understand correctly) puts a lot more difficult spin on things...

- Michael