Here’s an old woodworking adage I enjoy ignoring: “measure twice, cut once.” Honestly, I measure nonce and cut thrice. I often eyeball it. I use pieces I’ve already cut to measure what I need to cut. It’s not a great habit, but I prefer it to measuring everything. And the results usually aren’t that different. At least that’s what I tell myself. I ended up having to sand down the ends of the 2×12’s running the length of the table (where they meet the aprons) because they weren’t exactly the same length.
This super-strong and simple-to-build workbench is may be the project you've been looking for a long time. You have to select some free workbench plans to create yourself a working table in your shed that after you can use it when you are working on your projects and maybe it can provide you some extra storage, depends upon which plan you are choosing to DIY.