I thought the 3.4 was no gain to be had
I think making a new plate is way over complicating things...But thats JMO
Large gains in flow over dual WD CP3's maybe not. But for simplicity as a whole, other than the front cover issue, and the lack of parasitic load from a belt driven 2nd CP3, plus less wiring, I think it would be better and an option many people would go for when doing a balls out build.
Who has one of these? I really would like to see a CP3.4 in person just to see how much size difference there actually is.