I am wondering about a new Toto MS970CEMFG G500 integrated toilet installation. The dilema that I am faced with is that the distance from the wall to the center of the floor drain is only 11 inches. The specification guide calls for minimum of 12 icnes roughtin; however, within the same specs the drain size is stated to be 2 inches wide. The drain size that we have is 4 inches wide. Would it be possible to fit the toilet into the space that I have? Please advise. Thanks in advance.