The block you describe is possibly called *FourPatch Posey* (google that). The technique for OBW and stack and whack and poseys regarding pinmatching the layers of fabric is pretty much the same... and you do NOT wash the fabric first.. its a BIGGIE... not washing it.. as it distorts the prints and you cant pinmatch them. You could try the suggestions on trying to reshape your fabric with steam and whatever.. but if it was me i would use the panels for something else... and get four layers of new fabric...... hard as that sounds.