AutoCAD Inventor :: How To Model Flexible Safety Cover

The company I work for manufactures safety covers of all types. Some are pretty easy to model. The ones made from folded fabric,....not so much. 

I have taken a couple of photos and uploaded them so that you could see what I'm trying to model.

As you can see from the photo, it's an accordion like cover that is "U-Shaped". You would install this over a linear rail and have one end anchored to the frame and one end anchored to the carriage. So it would collapse and expand as the carriage moves back and forth.

We call the convolutions "vees" (obviously because they look like the letter V). When you compress the cover the Vee Depth increases. And when you expand the cover it will decrease. The folded section at the ends, at the small "legs" is where I have the difficulty. It's sort of hard to explain. That's why I uploaded the photos.

I'd like to be able to make a single "Vee", and have it have adjustable constraints so that I can expand or contract the cover by adjusting one number.