hello nem ! well, I´m working on the same like you do. I´m still trieng to model a simply part from a car, a vehicle or an airplane, or something else. And I use the technique with EP Curves, and than Birail 1,2 or 3. I will contact you with the MSN. Maybe we can talk about that - I have some ways how you can use the birail option. bye for now, bernhard