This model is not scale specific. It can be used for scales from 15mm to 28mm. See the last product photo for dimensions.
The following are the full scale overall dimensions in feet when used with the following scales:
28mm (1/56th) Height 13' Width 16'
20mm (1/72nd) Height 16.5' Width 21'
15mm (1/100th) Height 23' Width 29'
Model is made from 1/8" (3mm) MDF