I have just included the option to add 3 1/2 or 5 1/2 inches of overhang on all 4 sides. Check it out here in Step 8a.
April 6, 2013
I have also included the option to make your shed 12 inches taller which will give you more room to store tall and long items vertically. Check out Step 4a: Optional 8ft Wall Height.