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Zerohour: What you propose is standard on most vehicles I owned (Fords & Chevys) since the 70's. They basically all work the same: A cowling around the exhaust manifold, a metal hose between the cowling and the air filter housing, and a thermostatic valve in the air filter housing.
The valve in my current daily drive (Chev) is a simple mechanism. A flap directs air from either the cold air intake or through the preheater hose (metal flex). A sealed wax cylinder closes the flap to the cold air intake when cold, directing the preheated manifold air into the filter housing. As the air warms up, the wax melts, the flap opens and the colder air flows freely. Simple and effective.
You can exclude the door lock mechanism. switch and indicator by picking up a thermostatic filter housing, cutting out the valve mechanism and adapting it to your intake setup.
Some older versions were vacuum assisted and prone to failure. The current setup works well.
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