After 8 years I once again laid some track!
Since I am reusing track from the previous layout it is a bit more tricky to use pieces that were cut previously etc. but I expect things to speed up now that I have most things in place.
I started at one end of the lower hidden track area. I also made a template to easily see the correct track spacing from the rear wall.
The trusty BR216 with a Märklin 6080 decoder showed that all is working.