The secondary hull has a tunnel that passes through the arch that the neck connects to.
Is it possible to route a turbo-lift around that tunnel?
The short answer is: yes.
How does it work?
A turbo-lift is essentially a cylinder.
If you take a line from the geometric centre of the cylinder to the furthest point from the centre…
and you make a sphere with a radius, slightly larger than that line…
then you can tumble the lift around the centre to orient it in any direction.
Tumblers
I call these spheres: tumblers. We can have tubes enter the sphere from any direction and leave in any direction. I realised that I only needed to tumble the lifts around a single axis so I used more cylindrical, flattened, tumblers to save space.
This is a single tumbler. It changes the lift orientation from vertical to angled, as it enters the neck from the saucer section.
The structure below is a “ball cap”. It can rotate within the tumbler to act as an airlock. It blocks the entrance to the neck until a lift wants to enter.
It has a single hole that rotates into the vertical position to receive a turbo-lift. It always rotates the long way round. It delivers the lift to the angled tube that passes down the neck. Going the long way round ensures that both tubes are not open at the same time. If the hole is positioned facing forwards then both holes are blocked.
This is a picture of the, undocked, secondary hull. It shows the ball-cap blocking off the turbo-lift tube.
A combination of three tumblers and the wishbone shaped structure lets a turbo-lift pass either side of the tunnel through the area that the neck is connected to.
When the turbo-lift reaches the bottom of the neck, it passes into the first tumbler that rotates it into a horizontal position, aligned with the long axis of the secondary hull.
It then moves down into the wishbone structure to pass around either side of the tunnel.
It enters another tumbler that rotates it into the vertical so it can descend through the secondary hull.
Will the motions make people sick?
No, the ship makes it’s own gravity. Down will remain down inside the lift.
They also have inertial dampeners that cancel out the accelerations imposed by tumbling and sideways motions.