Hi Kevin, just one other note, you wrote:

> Nurbs by its nature seems to create tensions in the
> surface when lofted or swept which often warps the
> nurbs surface to bumpy shapes.

That kind of thing is going to happen to you a lot more often if you try to build directly to every single 3D edge curves of your final result (like what you were showing on your initial approach for that windshield), rather than building larger and more simple surfaces and using trimming and booleans to form the final 3D edges.

I know that it is a bit odd because other styles of modeling do work more directly on placing all edge loops more directly.... But that approach is not going to work well with NURBS, it is not the natural workflow for NURBS.

For NURBS to work well you need to generate broader surfaces that match a more 4-sided topology, then cut away the areas you don't need to form the final edges.

- Michael