I've had a setup like this for years, but it's much simpler: monitor arm [1], ultrawide display [2], keyboard + trackpad lap tray [3], any couch. Been through many iterations and like this gear, but you can do it for cheap just as easily. Mount the arm to something (like a desk) and swing it over the couch to lay down. In my case, I can actually pivot it between the couch and the chair on the other side of the desk.…
Same, I put my desk next to a recliner and the monitor on an armature and just swing it back and forth. The downside: the arrangement is kinda comfortable so I tend to play games in it. As a result, my mind associates it with non-work and have trouble focusing there. Also laying down all day is probably not healthy.
I actually think the biggest downside to the multi-station dynamic setup is that the ideal monitor configuration for that is a single curved ultrawide, and there are essentially no high resolution options.