Here's some shots of the interior of the cockpit and the troop hold, as well as a view of the rear opening with the hatch closed (it splits horizontally through the middle, with the top half pivoting up to the ceiling of the hold and the lower half pivoting down into a sort of ramp- this is where the rear machine gun is mounted when it's fitted).

The parts lining the sides of the troop hold are the passenger seats with overhead cargo nets.