First of all it's your problematic field of interest. Then you should find strong ways to solve/improve/new design your thesis tasks. And only after completing your problematic area you can use this 5 chapters to describe your personal achievements in Engineering field.
I recomend you to start with the Literaure review(At least 30 papers of relevance), to found some gaps that could be of interest. An make a rersume of this.