As you will see on the web, the physics package was approximately under the suspension lug.
I am not sure why this one has a black nose. The nose should be a translucent fibreglass. The two red blanks are for the turbine inlets and the red one on the side is the turbine exhaust. The green hatch behind that is for access to the ground impact isolation 'switch' or the switch to make the weapon airburst only.