Model Target not showing up in Unity

Hi there.

I am currently following the Vuforia tutorials of using the Model Target Generator to create a model target of the Mars Lander, and the tutorial of introducing the model target into Unity. The problem I am having is that once the model target has been imported into Unity and selected from Game Object -> Vuforia -> Target Model, the actual model does not appear in the scene. In the Hierarchy of the scene a model target is apparently there, and I think its connected to the AR camera, but nothing appears in the actual scene. Along with this, when playing the scene there is no 2D guidelines over-layed onto the screen. I've been over both tutorials multiple times and I'm sure everything has been done exactly the same way.

I know its a bit of a rogue problem, but any help or suggestions would be much appreciated.

Thanks, Johnny