Yep, the half bulkhead comes up to just below the top of the pilot's seat. The main bulkhead, with the armour-plated doors, is in line with the first (forward) fuselage transit joint, which is moulded on the outside of the fuselage halves. If you decide to add any internal detail in the rear fuselage, note that the Mk1 didn't have the ammo tanks for the cannons, as in my model. The guns were drum fed (each weighing 60 pounds !), with the drums being loaded onto each cannon through the floor (or lack of !). Extra magazine drums were stored on the sides of the fuselage, and were changed by the Observer.
To be honest, unless the rear upper escape hatch is open, not much can be seen of the interior, especially looking forward, and if the forward bulkhead doors are closed (as they are on the kit part), no light gets through to the mid-section anyway, so you can get away with a lot - or more correctly, with nothing !