Ok cool thank you guys a lot.
the gardena garden planner comes closest to what i had in mind,
however it is not even close to the functionalities and degrees of freedom
for a serius permaculture
desing tool. Actually it looks more like something that has been given
to a group of students to do for a semester.
So i think it's pen&paper for now, or the approach described in the video i posted.
Still if you find a more sophisticated tool, please let me know!