I had tossed around this idea for my toyota turbo 4x4 truck, since it has no intercooler and there is practically no room to put a conventional intercooler and may go ahead and try something like this, although my concern was that it would have to be installed right over the engine (although there is a fair amount of space to the bottom of the hood) and of course the subsequent radiant heat constantly hitting it. I suppose a 'shield' could be installed, although it seems to be that would block some airflow, but guess if it's done in such way as to draw (or push) air off to the sides and angling said shield down.
The other issue is getting air flow thru the intercooler with it being in a horizontal (although mine would be slightly angled up) position, even with a hood scoop directing air over it. Being that heat rises, what would be cool to consider is if you had the airflow go over the hood (not a scoop) in a way that would promote the heat to be 'pulled' out rather than trying to 'push' it down over it, where it doesn't really have anywhere to go (in comparison). Couple that with a puller fan/shroud and diverting it down and away from the engine and maybe somehow out the side sort of (this is hard to explain in words). The problem of course is when it's sitting still, or in heavy traffic and so on and more importantly when it rains and such (as in not having a full opening).
In an opposite manner, on my 5.9 ZJ it came from the factory with louvered vents because those models had an electric fan (vs. 5.2 and 4.0 had mechanical) and even with the 'baffles', it worked suprisingly well to help draw heat out; would like to do something like that on my (nissan) truck, but with regard to the IC on the (toyota) truck, perhaps louvers somewhere would help after diverting the air thru the IC and out over back thru the louvers.
