I suspect that many in the photo are members and officials of the church who have volunteered to help.What a clever idea to have them hold the tools of their trade. Why are so many wearing shirt and tie? Is that what they wore for construction work? Did they dress up for photo day? Maybe it was taken one Sunday after church and they put their overalls and aprons on over their good clothes. Such an interesting photo with creative direction!
They would be the well dressed folks (ties and vests).....the full-time workers and craftsmen would be in their working clothes.
There would certainly be no work done on "the Lord's Day!"