Voltage regulation circuit 12V to 5V in 5A range

[Demon]

EDIT:

At first I was tempted to make 2 prototypes; 2 layers and 4 layers; just to see if the extra cost is worth it. But the more I think about it, the more I'm leaning for the 4-layer design.

Two of the main objectives with this circuit is to reduce heat and stabilize the voltage (ripples). If the pros design their Eval board to that size with 4 layers, I can't really see why I should consider cutting corners.

But boy am I tempted.