I found some papers which could serve for further ideas, although they are not from Manufacturing Industry. Maybe the mentioned scales yould be adapted for your purposes. Have a nice day.
Article Evidences of validity of a scale for mapping professional as...
Article Major project managers' internal and external stakeholder re...
Article An Instrument to Assess Competencies of Providers Treating S...
You should take a look at the Competency model within the Supply Chain Operations Reference model (SCOR) published by APICS Supply chain Council. Please check on the APICS SCC web