Groovy, I have a wonderful reference book called All-in-one Quilter's Reference Tool by Harriet Hargrove, Sharyn Craig, Alex Anderson and Liz Aneloski which I was able to put my hands on. I'm taking your 7 inches as a finished size, which would make setting triangles (side) cut at an 11.25 inch square. Your corner triangle will start as 5-7/8 inch squares (I'd make them 6 and trim down the sides before putting on the borders. If your 7 inch block is NOT finished (making a 6.5 inch finished block) your setting squares would need to be 101.5 inches and corner squares at 5.5 inches. Good luck! Hope this helps.
Linda in Missouri