definitely 30's and up to WWII. I doubt into the 40's
Are they broadcloth or feedsacks. They look like broadcloth quality. I have a small top similar to that.
And........fabric in my basement of the period.
Your profile doesn't say where you are from which would indicate the route you will be taking to Vermont.
If you should be going thru Massachusetts and in or near Sturbridge, there is a shope here that has vintage textiles.
You also will be able to find new solid fabric in the colors of your blocks that you could get for sashing and borders. It would be difficult to find enough vintage solid to complete it with sashing and borders.