One way to get the most use out of those increasingly rare solartex scraps is to make fabric hinges. Take two strips of solartex and run them through a sewing machine with the adhesive sides together. You may want to separate the pieces with some plain paper so they don't stick to each other. A straight stitch is helpful. Iron on the hinge with the stitch between two beveled surfaces and then cover as usual. This provides a nice gapless hinge. Once upon a time this was a commercially available product.