I first defined the shape with world edit circle, then I die trying to get same size patterns(4-5 block flat = 3 blocks diagonal, use the theorem of pythagoras). For the details of the builds, I simplify it, It's easier to work with simple detail on surfaces with angles, and I try to work on rather flat surfaces, Diagonals are more complicated. So I put the pillar on the diagonal, as I consider it as a cylinder, I keep the same.