Presumably double external monitors requires a GPU which can support triple head monitors? (2 external + the internal display).

I know you could probably get away with a standard dual head GPU, but then you'd need extra parts inside the laptop to handle switching the driving signals between the shared external and internal displays.

Does the clam shell mode on the mac automatically stay awake if there is an external display connected, or do you still have to use the external keyboard/mouse to wake it after it goes into clamshell mode?