I would paraphrase your question as 'do best practices in the race car field apply to ecomodding?' Close enough?
Your question could use some more context (like you pic #1). Ecomodding extends from someone looking for pay-back within x000miles, to some one building their own reverse tricycle. Here's you theoretical ideal:
The size of the ducting package isn't trivial. Also, immersing the engine itself in turbulent moving air has to provide some degree of engine cooling; sealing it in a close compartment should throw more load onto the water cooling subsystem.
Consider the warm air intake. One has to admit sufficient air to supply the intake. So the radiator and induction have to be outside the sealed compartment.
There are
other threads that suggest the bottomside or wheelwell as the best place to dump the radiatored air.