I know my garage floor slopes, and I don't think a lot of other stuff in the house is real square. I'm only concerned about squaring stuff, because the first thing I built this year was a cat tower. Same basic concept for a box filled with sand as the base on each side. Everything was fine until I attached the boxes to the center post. An hour and 1.5" of shims later and the thing can finally stand up and pass for level in the dark.
Here is the garage now:
Step one: Randomly run into a guy with a truck and get him to get rid of the stove. You guys see my work bench? Me either. First two shelves will replace the metal one on the left and the wooden one on the right in this picture. Next will be similarly tall shelves where the water is at the end of the garage. Finally will be long, low shelves in between to fit under the windows.
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