Mechanism and template for labour cost for a construction site - almost 400 casual labourers daily, provided with lunch, work for 8 hrs a day

Hello, hope you are all well? I have been tasked to provide a labor cost for a construction site on a daily basis. We have a pool of almost 400 casual labourers daily, provided with lunch, work for 8 hrs a day and if if they work for more hours overtime is given plus their wages are paid at the end of the month. Please share the mechanism and template that can help me.
Thanks in Advance

Dear Marvyn,
In my company I deal with manpower cost for various projects all over India. I have drafted a standard format to calculate the monthly manpower cost. Though this format is related to fixed nature labour with statutory cost.
Hope the format will help to meet your requirement. You can re-draft the structure as per your requirement. If any more clarification required, do let me know.
Seniors can throw more light on the matter.

Thanks alot, let me re-draft it so that it aligns with the structure am working with. Will give feed back . Much appreciated