Not as far forward as some; but now at a standstill.
I Ignored the 'line' clues and concentrated on constructing the 'Original' grid; have cold-solved all 'Originals' except two - the unauthorised bus occupants, and Malibu, which in spite of knowing their initial letters, have me baffled - hints appreciated.
This has enabled me to fill about 72% of the grid, albeit with some worrying single-cell clashes that appear to be unavoidable, but aren't mentioned in the preamble or in this Forum so far. More worryingly, some of my confident solves don't appear to fit anywhere. Should there be clashes to resolve in the Original grid, or am I completely astray?
I'm also seeing some apparent partial words emerging in the 'empty' original lights, including an obvious mollusc, but these may be red herrings.
I'd better concentrate now on solving the 'line' clues to see if they bring any enlightenment - the preamble seems to promise a game of topological 3D chess, which may be enjoyable , maybe not.