Simon, we are running two electric water pumps and feeding each side of the engine with each. There is a remote oil cooler/ oil bypass/pressure regulator on this that is cooled from the radiator same as maxed out.
The turbos have there own oil supply, tanks, and pumps separate from the engine. We did this for two reasons, like you stated the drains are a bit low and second i like having separate oil for the turbos.