I closed and finished the lower part of the sidewall. The working steps were always the same for every part I did. Making a rough paper template, fitting it to the gap, tranfering the shape to 10 mm MDF, chanfering the edges and fixing it. I realized that both sidewalls came out with a little bit different measurements. So I had to cut the parts individual for both sidewalls. And this is the reason why it doesn't make sense to create plans for this working step. Your sidewalls will have different measurements too and you will have your individual templates.
But I've made a set of pictures from the parts.