I would suggest CC-BY-SA

You can do this by doing as little as making a single file named LICENSE in the top level directory, with a single line:

    This work is licensed under CC BY-SA 4.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/4.0

It is the hardware/artwork spritual equivalent of GPL2. It means the user must not remove your name, must make source/plans available, and commercial activity is ok.

Just a suggestion if you don't know where to begin or what to do, hadn't really thought about it or read up on all the infinite options etc.

Thanks for the suggestion, I've added this license to the project.