The picture to the left is where the idea comes from. For lack of a better way to say it, let’s call this project high rise skirting. The idea is to improve the look of the lower portion of this deck and soften it with some curves.
I simply measured each space, come up with an appropriate curve and simply duplicated it each time. I covered the seams int eh center with a ‘keystone’ like that used in stonework, only I used a scrap piece of 2×10.