Just finished my first railsweep for my ConvertaCar.
It has some issues. I removed some of the curves and added a 3rd rail to smooth it out. Seems better now in the Green section.
I went through all the Tech Talk videos. Those were very helpful in learning how to use the basic features of Sketching, Blending and Sweeping.
Right now, the body looks like a mini-vacuum. Not good!