Sorry, kann das leider nicht so einfach machen.
To your question:
It is very uncommon that you have to resize the root partition to match the full disksize.
Also didnt experience that yet with netcup servers..
So this is not really something for the libre workspace docs, but we can insert the minimum hardware requirements to the docs as well. Currently they are only listed on the website 
OK, war nur so eine Idee, da das ja nicht unbedingt zum Release gehört.
On netcup servers, you have the option to insert an ISO image or install a minimum image provided by them. When installing the minimum image, they ask you to choose out of two partition schemes:
It would be great if it is above the installation description. I think this is the place where the most tech people will look for.