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Hey Floor, good question. I think you'd find you need many large fans and some way of making the flow smooth to have a homemade wind tunnel. We're talking a very large building, several hundreds of horsepower in fans and complex air handling, far beyond the reach of most folks who wanna test little changes.
Moreover, your questions seem to ask what you can do in the front of your car to make it more aerodynamic. It is a common misconception that the front being smoother will net you real gains in aerodynamic performance. However, the nooks and crannies are not what to look for in front, and your biggest gains are in the rear of the car in controlling how the air leaves your car.
The big picture in front is trying to get as much air as possible over the top of your car, and being stingy with what goes in the radiator. Smoothing over lights & such will not be very beneficial since the air sort of forms its own aero shape in front of these features. What car are we talking about? Hope these rambling thoughts help.
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