[TurboKraft]

I would think if the iron pump housing were necessary, Porsche would have re-introduced it on the later Mezger engines i.e. 996/997 Turbo, GT3...

Why 2x squirters per piston? Sounds like a lot of unnecessary planning and machining for an indeterminate amount of benefit. If you're looking for additional piston cooling and/or lubrication, there's better, proven ways to go about this.