I built about 6 at the time, haven’t built any since. The template was made from the nets I ordered, once I got the net I just laid it out and measured length/ width and free hand the curves.
Actually we need more of this in the woodworking world. I've been a carpenter and woodworker for over 35 years, but still watch videos to learn from others. It takes a lifetime of learning AND doing to find out what works for you.