Yesterday I visited a carpenter and I was (again) astonished about their modern skills and abilities. I gave him the idea and some formulas and he used his computer with Autocad (I presume). The computer will control his machines. He gave me this drawings and they will give you an idea what will be done.
May be you like it here.
You may wonder what is this about. I'm teacher in a school and I was asked to make a "Projekt-Kurs" about horn loudspeakers. (The theme was not discussable). So I have tried to teach the pupils some historical aspects - so obviously I had to mention JBL - and I have given them a practical try.
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Regards
Peter