For the past couple of weekends, I have been in the shed rebuilding the other corner (a drop in section),that is at the garage door. This is part of the re-organizing for the level change loops, yet to be built, but in the design stage.
The bottom track curve run was then estimated using my rough compass. Yet, there was change to come, as it was decided to swap some of the lower track to the fixed wall frame work. things became interesting, as the levels had changed since it was built, and required correcting. With that work undertaken, the frame work, now lined up, it was just correcting the height of the top track, so it, also lined up.
With the evening temperature dropping, it was time to stop. Still work to undertake, wire up and test.