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This is the frame of a butterfly firebox door frame that has an opening appropriate for 3/4" Scale. The opening measures 2"x1". In truth this door is around 1" scale, however firing a 3/4" scale coal burning locomotive would be difficult if it had been left at true 3/4" scale. Ive included a photo of what the completed cad model looks like. Drawings for finishing the unit could be provided if demands arise for them.