On Sat, 9 Sep 2017, jezZiFeR wrote:
• I would like to have smaller font sizes for the chapters and sections
Jess, The renewcommand{} in the preface can do this.
• have a separate colum for time-entries (I could use margins if needs be)
Try multicol.sty. You may need to install it, but you can adjust the column widths. I don't recall off-hand how I've made modifications (in the preamble or by embedded LaTeX) so I'll let others contribute ideas. This web page might be useful to you: <http://komascript.de.pagesstudy.com/>. HTH, Rich