Based on photographs of a shed in the goods yard at Freshwater, Isle of Wight. The window opening of the 2mm/ft scale model is designed to fit etched brass window frames from the Ratio Plastic Models 'Industrial Windows' set, Ref.309, available separately. Suitable alternative window frames will need to be sourced, or fabricated. The finials on top of the gable ends are too fine to survive the printing and delivery process, so have been made available separately.
https://www.shapeways.com/product/QSBPDWRAW/gable-end-finials-4mm-ft?&li=shop-inventory