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Strata 3D Tutorial
There is a way to model cars in Strata, it might be not to easy but it did work for me, more or less. I used bezier surface to model all the carīs panels. -You need to have some lines to descrive your design in the front, side and top views. -Then you can start building a rectangular plane to start modeling a first panel of the car. You convert this plane surface into a bezier surface. -Then with reshape tool you can select the points and move them to adjust this panel to your guide lines. You can also use the pointīs hanndels to cuve any way you want. -If you donīt want to model it panel by panel do a skinning and convert it to bezier. -If you want to divide a panel into two different ones. What I do is to add an extra line. Then I duplicate the same panel over it(so it will be exactly in the same position). Now with the reshape tool you select the extra points and delete them in each of the two panel. -There are many ways to obtain your panel in orther to convert them into bezier. Bezier is a very nice way to model becase you deal with not too many points(with nurbs you have to mannage with many more points). For example anoder way to obtain your bezier panel is by extruding some guding lines(this way they will be easier to conect them latter.
Guiding Lines in all views(Front,Side and top)
Using one of the guiding lines to extrude. It will became our first pannel of the car.
Converting the pannel to bezier
This way we can manipulate the pints and change curves qith the ointīs hanndels
Since you have only four points it is easy to model. you also hace two hanndels for each point(they can be continous or you can also brake them). They work the same as ilustrator but in 3D)

Dividing the pannel:
1 With (Alt for PC and Command for Mac) you will add an extra line with two extra points. This will be oir dividing line.
2 Then we need to duplicate the surface (you can do this coping and draging, you will need to undo) becase this way the copy will be set on the exact position as the original surface.
3 Reshape to select the extra points on each surface and delete the extra part of out two surface.
Here I show the two diferent surfaces witch are perfectly merged

You cand do all the pannels this way.
But there are other way wich may be easier to you.
For instance you can modeled the whole car out of one extrusion or lathe, and then diviing it all peace by peace.


Examples