Today I finished the liftout section. All jacks are in place and I screwed a piece of plywood on top of the beams. I also connected the electrical leads to terminal strips. Eventually, track power will be routed from those terminals. Below the underside of finished the liftout is shown.
The next photo shows the liftout in place, i.e. connected to the rest of the layout. As you can see the electrical leads from the jacks first go up through the plywood and then down again through another hole. It certainly looks as if they will be in the way when I finally lay track! That is however not the case. I will glue a layer of extruded foam on top of the plywood, both on the main layout and on the liftout section, and then the leads on the liftout will be buried deep in foam and not interfere with any track work.
Lessons learned: I choose to use 6.3 mm (1/4") stereo jacks. They might be a little to sturdy! There is a problem lifting the section straight up, since the jacks do their best holding back, and they do not snap loose all at the same time. As a consequence the section tends to come off an angle (one end first). This might perhaps damage the track, at the joint between the layout and the liftout. The future will tell. Anyway, if I was to do another one like this I would try smaller, 3.5 mm (1/8"), jacks instead.