The Beaufighter crew/operator canopy was attached to the fuselage panels and during maintenance -or emergencies- the panels could unfastened and the canopy would swing open to the side (the crew would normally enter via a hatch in the fuselage floor).
This detail set provides you with two canopy sets, one for the “observer” configuration and another one for the “rear gunner” of the Beaufighter. I believe the observer configuration (radar operator) was only used in the MkV/NF version of the Beaufighter.
The canopies are casted in clear resin. Please note that this replacement part includes some sharply casted detail in the panels surrounding the canopies as well. In order to use this set you are expected to remove some plastic from the fuselage of the airplane and the extra panels around the canopy will replace the removed parts. By the way, the removal is done along panel lines so it will be easy to do the removal on the model parts.