yes. but I love a good challenge ! I am in the process of making my own towers. I am at the resourcing stage ; ) will tell you more when I advance a bit.
another oddity I wanted to share with you. Yannick draws the 51 degrees as the top angle (the point) as in here:
but when you consult a pyramid calculator the angle is marked as the base to wall angle as in here:
what are your thoughts on that ?
I am actually going to measure the angle of the point on a photo of a Callahan tower ! see what I get.