Shop heartland (common: 12-ft x 10-ft; interior dimensions: 10-ft x 12-ft) statesman gable engineered storage shed (installation not included) in the wood storage. Diy gable garden/storage shed plans. detailed step-by-step instructions from start to finish.. 12×12 shed plans, with gable roof. plans include drawings, measurements, shopping list, and cutting list. free pdf download included..