You gonna pull those pistols or whistle Dixie?
Have you tried to perform or learn the loading calculations and the stresses at the joints? When you do, you'll typically see that they are build with enough margin of safety for just about anything if done right. That shed has been build quite a few times according to people I've seen mention it here. If there were any doubt, I'm sure we'd have heard about it. I'm sure this frame has been examined numerous times. As long as you have followed the plan and used materials that were up to spec... you shouldn't worry. If you're still worried, find out how much a TF outfit would charge you to do the calculations. Heck, even someone on here might have done it and have them.
