You might be able to get some tips from the attached full version Creo 2.0 file.
Image may be NSFW.
Clik here to view.
This file is set to the default Y-factor of .5. You can change this to be more accurate.
I used a projected sketch to manage the twist compensation prior to the unbend operation.
be careful with the twist as you have to manually manage the developed length to be equal to the twist length. A relation here might help.
The idea is that you are using the geometry of the initial surface model to create features. You can use analysis to capture values such as 85.0191 degrees, or the location of the final cut. Planes and axes will also provide a lot of valuable references.
Also notice that in the real world, you will have some trouble forming this part after laser cutting the notches and ends. The top end doesn't have enough to grab in the tube bender, and the lower end will likely deform due to the large bit taken out of the material.
Good luck!
