Hi,
I am also working on a similar project but in an NGO. My project has already started, and I may be able to help you out a little. Since you are working on the project in a manufacturing firm, first of all, try to study the work conditions, processes, and everything else related to the practical situations there as much as possible.
Secondly, decide on the level of employee you are going to survey, whether it is top, middle, or lower level.
Thirdly, try to find out the policies and procedures followed in the organization. After that, conduct a thorough study on the job profile of the selected level of employees.
Fourthly, identify the factors you will consider for measuring the satisfaction level.
Lastly, prepare a relevant questionnaire.
This is how I started, and I hope these steps will help you. Good luck, my friend.