Here is how to change the width and length of my corrugated panels to suit your needs. This model is in inches and thus all dimensions of this tutorial are in inches. SW will convert dimensions for you so if you know you want a dimension to be 3 meters long just type 3m and it should convert it for you.
Answered with a tutorial: https://grabcad.com/tutorials/tutorial-how-to-change-dimensions-of-corrugated-roof-panel
More simple than I thought... great work!