There's no really reliable method to convert a complex 2D drawing to a model - there's a lot of guess work involved. By the time you write and test the software it could have been done by hand. That's why the normal process is to design in 3D in the first place, then all drawings are derived from the model.
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If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.