Yeah, the version on TBT describes the lower level as much as possible:
at the cost of obscuring that you can go from the northern courtyard to the western overpass - it's always been the setter's responsibility to avoid this junction in most directions because it's basically impossible to draw the multiple levels without any ambiguity. The underpass symbol works somewhat, but even at 1:4000 I found it unclear, and someone always misreads it at speed.
There was also a map error at this building corner:
where there was a control. The path continues on to the north, but I'm not sure if it's a dead end or not. Nearmap suggests it's always been there, so we should probably fire the mapper. :)