You really need to invest in a walking foot. Try a local sewing machine retailer, they should have one or Nancy's Notions, I know she carries them. They usually run around $25, but are well worth it. I did a denim lap quilt awhile back and I know how difficult they can be. Be sure to have plenty of support going into and out of the machine and have extra needles. I manage to get by only breaking two I think. I might try another one someday but if I do it will be a quilt as you go. Let us know how it all comes out maybe even include pictures. I know your going to succeed! :D