When you make a scale model of a building, its SIZE is reduced. 
The model is lighter than it should be. 
Your model must carry extra weights to correct for this problem. 
We are only using one size of steel block to minimise the total number of steel blocks we need to buy. 
If we used lots of different sized blocks we would need quite a lot of them to make sure we could load each model accurately. 
That would be very expensive. 






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