Hi keebo, another thing I forgot to mention is that I'm actually currently working on a related thing for the first v2 beta which is snapping points directly on to surfaces.

This should help solve the problem even before being able to set the regular construction plane, because you will be able to create a rectangular plane object going through that curve, and then when you drag its control points they will be able to snap on to the plane surface.

I'm still in the process of working on this right now but I do expect to have this for the first v2 beta in not too long.

- Michael