Ford Pranther set me these two wonderful Bulder Board videos of a cedar set he built. The first set I built was using cedar boards, too.  It’s cheaper and you don’t have to worry about finishing, which is a big job.  He shows another way to cut the notches: with a table saw. Using a table saw will mean more sanding rounding the sharp corners and points.Builder Boards, a short history

Here are his kids playing. You can practically see the wheels turning is his son’s head.

https://www.youtube.com/watch?v=bAWOAeZfHCA