Yup I need to put perks into that too, weapons are the easiest source of steel and screws. Clearing out a den of raiders or super mutants and getting 10 or so weapons usually nets about 80 steel with little effort with only one point in scrapper.
Post pics. I only just realised the barn set included glass windows which I would have used in my factory. Not sure if I can be bothered tearing the concrete windows out or hope someone makes a mod to add glass to them.

Concrete shipments are the way to go, cheap, abundant and much easier than hunting for bags of the stuff. Even better if you install the better shipments mod.