@EternalDarkness I will try it.

@metallicplanes just assemble it as seen on the picture. Rocket will fly carrying the detacher, and body will stay attached to detacher.

@EternalDarkness I don't get how I will make the custom body fire with the rocket. Do I have to nudge them inside one another?

@metallicplanes did you even look at the picture I linked?

@EternalDarkness I don't know how to connect the wings to the rockets.

@metallicplanes green lines are connections. Connect the custom body with wings to the rear side of detacher, rocket to the lower side of detacher, connect it all to the plane by the small side of detacher, and add a camera. Optimally, don't have any mass or drag on the custom missile body, just on the rocket itself.

@EternalDarkness I don't know how to connect them. I want to be able to control it from first person.

@metallicplanes you can build a custom RC missile, if that's what you want. Apply this trick to an unguided rocket and use control surfaces to steer.

@EternalDarkness So that does work. Guess I can't have everything.

@metallicplanes The "device" projects a target onto the surface, like laser designator. Missile follows the "dot" that laser makes.

@EternalDarkness It works. But sometimes it doesn't lock on to it. And it has to be stuck to the ground.

There is this laser designator mod which does exactly what you're asking.

@WhyAreWeHere erm... no. It is very much possible.

@Minecraftpoweer that would be majic

@WhyAreWeHere What if I told you that you can actually just put the wings on a rocket instead of using a tiny jet engine?

You can make a little detachable rocket with tiny wings and a tiny jet engine

@metallicplanes what would the controls be? Pitch&roll?

@Minecraftpoweer It doesn't have to be like War Thunder. Just a controllable ATGM

probably possible but it wouldn't be like war thunder.