I found a module (single file) contained within a large project (100s of files) on github that was of use to me. Licence is MIT. I created some PRs but the author didn't seem to have the time to accept them. I asked for permission to set up a new project using his module and they were happy for me to do so.
I copied the module and created the new project giving full credit and linking to the parent repo and author throughout. However, in hindsight I feel that a better method would have been to fork the original project and remove all of the surplus files, rename the project and then start from there. In this way the new project would have been properly linked to the original and contain all of the history, as well as a more explicit acknowledgement of the original author.
This is on my conscience and I don't want to appear to be stealing credit for other people's work. Have I broken etiquette? I'm happy to start again and was in the process of doing so but noticed that I couldn't create issues against the forked repo. Are there any other disadvantages in forking and then reducing?