Skew
I decided to model Saddleworth Viaduct despite it being quite difficult.
First off it’s curved which is always a challenge. Then it’s got points on it. That’ll need a seperate post. Then it is long (about 2m scale even with compression, ie removing almost 1/2 the arches)
Apart from all that, there are 3 skew arches. With compression I got rid of one but the other two were key. One is over a main road and the other is over the Huddersfield canal.
The last one is especially difficult given the multilevel canal that has a loch that drops UNDER the arch.