Thanks Michael. I feel your pain. And sorry if in my post I sounded a like a lil jerk and a whiner.

But, yeah it probably is a rigid projection. And I looked at the javascript, and I can follow it pretty much.

I think you already have the tools we need. We'd need to project a point along an axis and intersect with a surface, we need to be able to calculate the distance between two points on a curve, and we need to be able to constrain by a 3D distance.

It might take a while for the script to process, but, I think it's a great feature and worth a look.