Model the Al Janoub Stadium using Dynamo in Revit

The first parametric tool I’ve learned is Grasshopper,however when I start to remake the model using dynamo I found myself fascinated by Dynamo.This is the practice of modelling the stadium of the Qatar World Cup.
However when I was doing the visual programing tool,I found the node ByLoft(with CrossSections and guiden curve) didn’t work .So I give up the method and trying another one.Do anyone also found the node ByLoft(with CrossSections and guiden curve) won’t work in complex nurbscuves as well?
Here is the address of my uploaded video.
Model the Al Janoub Stadium using Dynamo in Revit

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