My clay sewer pipe that runs from the house to the septic has a major crack(chunks missing...can see water running) at a cleanout tee. I need to replace a tee and an elbow. I know i cant get clay fittings any more....so i will try to replace everything with pvc and fernco fittings. That's plan A. If the new PVC fittings don't line up plan B may be to make everything fit the best i can and then form it up and encase it all in concrete. Does plan B sound like trouble? I've never messed with this stuff before.?