It would be great if there was a project geometry function that could project the parts lines all in the same plane for the user to work from.
I have found that if I need to create custom connections that I have to redraw the outer lines of my reference parts to create points for my polyline. Which doesn’t snap to all the points.
I’ve made a screen cast showing what I'm trying to do.
https://autode.sk/3dboelw