I absolutely hate working on anyone else's work, so I don't think I would ever attempt to make one together. Even if you two had the same fabric loves, and both used quarter inch foot, each machine is a little bit different, even though it shouldn't be, it's for this same reason that the ruler/mats manufacturers, say that if you start with a certain ruler, to continue to use it for the whole quilt, and NOT to use the lines on the mats as lines to cut by.