There are 4 compartments on this aircraft.
The nose position for the gunner / observer, then the pilot and in the upper aft section is the rear gunner. The 4th position is the lower "turret" gunner position.
Here are the upper compartments / tubs.
Please note that the nose compartment has a gap in front. It would be obvious later on that the parts should match and the floor must be trimmed in order for the external nose skin to fit over it.
For now, the compartments are only dry fitted.
The lower position will be shown a bit later.
Isaac