To continue my train of thought. If your 4 section block finishes at 7 inches (7.5 unfinished), then each 4 patch block is 3.5 inches finished. Therefore, 3.5/2= 1.75 +.5 (seams) so each block part of this is cut at 2.25 inches. When 4 are sewn together, you should get a 7.5 inch unfinished block.
Please, if anyone sees this differently, please correct my calculations.