Another one already!? Dang shazza, you got too much time & mulah...

It's a biggen aint it! Interesting thing about the V2000/Black Pearl is that although it's HUGE, it's not always easy to get everything in, simply because it's not immediately obvious where everything should go (rads in particular).
I reckon the PA goes on it's side in the bottom, and turn the PSU on it's side (with an aftermarket back panel).

As an aside, would the PA140.3 fit in the base of the A20 on it's side?