A spline based rig. An alternative approach to using PathDeform with more control over twist and scale.
1. Create a straight Spline - every vertex on that spline will be a helper to control the position
2. Run Script
3. Pick Spline
4. Adjust X Y Z to align the orientation of the box to your spline
5. Adjust width and length
6. Set twist helpers - this controls the amount of helpers to control twist and scale
7. Subdivisions - this controls the final resolution of your mesh
8. Press Go