Helicopter with 4 sets of propellers

Here is a model which I don't know if it exists or not, but my imagination came up with the design.

You can see the shape of the helicopter is kind of like the LEGO Police Heavy Duty Helicopter, only this design  heavy duty in weapons.

The rear

All the propellers spin together by a simple gearing system beneath the  model.

The interior is split into 2 sections: Monitor room, and skydiving launch room. 

A closer look at the control panels.

I wanted to use strings in the model, but in LEGO Digital Designer, strings weren't available in the mode I was using. The chains will make do.