

Copyright is always about distribution. So yes, you are allowed to fork, but you are not allowed to distribute the copyrighted content to other people. And with the No Derivatives clause you are also not allowed to change it. You might be able to stay in the gray are by telling everyone “build it yourself”, but nobody would be allowed to package it either.
Heutzutage eher:
20 Patronen ausgegeben
15 Patronen entgegengenommen
10 Patronen übergeben
5 Patronen übernommen
6000 Patronen erneut bei rechtsextremen Bundeswehrangehörigen im Garten aufgefunden