Hi Ditto,

> Flow : Not sure how I could unroll the surface to fill. I am attaching the basis of all this.

There's a plugin called "UnwrapCurve" that can help with this, you can get it from here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5136.1

Probably use Construct > Curve > Iso to extract an isoparm curve somewhere around the middle of the surface, then use UnwrapCurve on that isoline to generate a line segment of the length of that curve, you'll then need to rotate that line to be horizontal and it will be the horizontal width of your flow base plane, do another UnwrapCurve on the vertical edge to get the height of the flow base plane, that should then help to reduce stretching.

Let me know if you need more help with using Flow here.

- Michael