Hi Gord,

re:
> Frames as requested Michael. It was network. They seem to become distorted for some reason.

Thanks for posting the curves!

So the first thing I see is that various curves do not have their endpoints touching on to the curve going in the other direction.

The first spot I checked was here:


And zooming in you can see the section's endpoint does not touch the rail curve going in the other direction:


Similarly here and in most other places:



So that's a big reason why your surface wobbles around a bit instead of being planar at its end. It would be good to tighten up the accuracy of your curves before you generate surfaces.

It is possible to true up the surface afterwards too though. To do that turn on surface control points, select the last row or column of points and use Transform > Align to get them all in a straight line in a side view. Do that before trying to construct additional pieces that should join to this surface.

- Michael


- Michael