BD1, if I get your question correctly, to access the rear compartment of the 21c TBF Avenger to place a figure in the ventral position, there are a couple different methods:
1) Insert the figure through the little door on the starboard side of the aircraft. (I always thought this opening door was a cool little feature
![Wink :wink:](./images/smilies/icon_wink.gif)
)
2) Remove the turret completely to access to the rear compartment. Follow these steps:
Pull the turret canopy piece off by elevating the gun and carefully pulling the canopy upwards. It sometimes helps to have the main canopy removed as well. The main canopy is also removable, though I didn't do it here.
Next unhook the turret seat by gently pushing the pegs on either side of the turret out of their supports mounted to the fuselage.
The turret is now removed and you can access the interior better.
21c even detailed some of the radio equipment in this section. Further towards the tail (unseen in these pics) they have the machine gun and flare chutes also detailed.