This model comes in several parts: canopy, canopy support posts and canopy ends. The canopy has been scaled for N gauge, TT:120 and 00 gauge. If you are modelling in 3mm the 00 gauge model can be scaled by 75%.
 
The canopy roof sections measure at:
N gauge - x2 100mm/33mm
TT:120 - x2 125mm/41mm
TT:3mm - x4 75mm/50mm
00 gauge - X4 100mm/65mm