I have started to construct the liftout section that will span the doorway. It will serve as a bridge, connecting the two ends of the layout, and making continous running possible. The liftout section will also serve as a small 3-track staging area.
The first thing I did was to screw supports to the underside of the benchwork. One support at each side. The liftout section will rest on these supports. The picture below shows one of the supports sticking out from under the benchwork.
I then cut the actual support beams to length. At the ends I attached some extra pieces of wood in order to make them wider. In the picture below the beams are just resting on the supports. Nothing yet that keeps them in place.
That is as far sa I got today. More will follow, and reveal the reason for widening the beams at each end.