The sliding panel for the bombsight was under the pilot's seat, the obs/nav crawling forward through the fuselage to take aim. The Battle canopy was normally kept open because it was so difficult to release, and when the bomb-aiming panel was opened a 200mph wind blasted upwards through the fuselage and made aiming impossible. This had terrible repercussions for Rupert and his crew, as we shall see shortly. Fairey could have used two canopies as in the contemporary Vickers Wellesley but they chose one extended canopy with solid decking between pilot and crew. I knew this only from seeing a Battle at the long-closed Strathallen Aviation Museum about 1980.
On the subject of crew accommodation Danny mentioned the Hampden 'flying suitcase' with all four crew seated together in the forward fuselage which was only 3ft wide. Apparently the Luftwaffe assessed captured aircraft and concluded the Hampden was the best because its crew were close together like Dornier 17 and Ju88. They did not rate the Blenheim, Whitley, and Wellington. Eventually the Hampden was withdrawn, a major factor being crew fatigue in such a small space.