If I was doing it, I would make it less complicated. I am sure you could do it with less than 1/2 the pipe that you have now. Maybe do away with the cathedral organ pipe return and valve system, and maybe use spa hose insted of PVC for some of it so you can bend it out of the way. Maybe have both pumps off to the North side, and plumbed in the North side sump end. You could still leave the sump where it is, just run a pipe around to the pump. In other words, make it less crowded, and run in through the back or ends.