Sounds like a good ballpark figure to me. Also looks like you are ok with math as well. Trust me on this one: math up your sketch before you build it. Catching a conflict or shortcoming on paper saves a whole lot more than a little time and ink. It usually spells out the difference between something that lasts 5 minutes (or less) and until something unexpected or unplanned happens. With something overbuilt, it may take years for something unexpected to happen.
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