"Open the cargo bay doors, HAL!"

I've started to work on the Orbiter's payload bay. In the previous 3D Model, this was not required for F-Sim Shuttle, as it was just a landing simulator.
Now, I have to stress, this is purely a test model to see how little (or much) I've got to modify the current 3D model to make the payload bay 'fit'. So far, the payload bay and test objects such ad ISS Modules fit perfectly.