These go on the same as the front pieces. Except I had to use nails rather than screws to hold them on since the screw heads would stick out because the sides are only 1/4" thick. I ended up using douglas fir for making these and scraped the meranti ones I had cut earlier. I felt they wouldn't be strong enough. The douglas fir was ripped at the 7� angle I found in the drawing so it would fit the curve of the top perfectly.