I have done most of the above. I once made a kit and ruined a bit of the fabric. I needed one or two squares of one of the fabrics and did not have enough. I took some of the larger pieces of scrap and sewed another scrap to the edge., pressed it and then cut the squares out. The sewn on piece was in the seam allowance. It was a bit bulky but I made it work. I use Rotary blades far beyond their useful life. I don't change my needle near enough. I save way to many scraps. I start too many things when I have not finished WIP.