That's more than lumber storage space.... That's room for you second floor shop too!!!! So jealousThe overall building measures 30 x 72, Ill have a 30 x 52 dedicated shop space inside. It also has a 12 x 72 open attic (load bearing for lumber) above.
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I see you may have an opening for stair access? Did you have a plan for bringing lumber and other things up and down?