The only place left to grow my veg, that gets any sun, is the patch of wall shown in the photograph.
I wanted to use window boxes in a stepped arrangement so that the higher ones would not cast a shadow on the lower ones.
I also wanted a structure that would take under an hour to build so that I did not lose heart halfway through.
Step 1: Feet.
They did not need to be anywhere as thick as this but it's what I had.
I simply put them against the wall at my desired angle and marked the tops and bottoms parallel to the wall and floor.... and cut them with a bowsaw.