I haven't made anything with home spuns but I have sewed almost all my life. When I am quilting and I accidentally choose a loosely woven fabric, I either cut extra for the seam (think 3/8" seam) or I sew every seam with a full quarter inch and then do a wavy second seam from 1/8 to the 1/4 inch sewing line. I've most often done the second way because I didn't realize I was going to have a problem until I started sewing and the material started raveling. If you are thinking about doing the extra size seam, I would make a test D4P with larger squares than you normally would and see if it works out. Or you could take colored paper and do the same thing without wasting any fabric.
I am looking forward to seeing your project.
Edited to add: We used to use pinking shears to help with the raveling, but I find that pinked edge so confusing when trying to decide where I am supposed to be sewing. "grin"
Last edited by Barb in Louisiana; 05-16-2018 at 07:31 AM.