I am looking at making a 24'x32' pole shed and was considering using Sonotubes as my post footings with a J-bolt set in the concrete. Then using the bolt on post base (6"x6") to anchor the post. I realize that I will likely need some diagonal bracing to tighten everything up. Is this a resonable idea? Would if provide enough strength to hold the building down? Any thoughts ideas would be appreciated.