Man, this project has given me a whole new appreciation for tank plumbing. This has taken way longer than I anticipated. The good news is that both drains have to be close to 100% blocked before the emergency drain is overwhelmed and that is with the pump running at the highest flow setting. Plumbing is more or less done.
I had to redo the drains, since the way I had them originally would not allow me to open the lid without removing them. It is still pretty tight underneath, but I can live with it.
The plumbing on the back requires 8.5 inches of clearance from the wall, which is more than I wanted, but I may be happy about it if I ever have to remove the plumbing with the tank in place.