Long time lurker, just signed up. I am almost done building my firewood shed and I'm starting to get nervous that it is a big parachute. The firewood storage area is 8'x16' w/ 2' overhang on all sides. The main roof is 10'x20', it is built on concrete deck blocks and definitely needs to be secured to the ground. The ground is very rocky and I can't get the screw in earth anchors to go deep enough. Looking to suggestions on what you may have done.