The original file has been printed. Took... 2-ish hours at .3mm because anything longer would have been simply unbearable for such a long file. I stripped the lamp cord and wrapped it around each area where coil ought to be and soldered it in place. Unfortunately, I wish I had thought of spray painting it silver before doing that. Oh well.
The blue LEDS arrive tomorrow so, in the mean time, I'm mocking up a snap-on back plate in tinkerCAD to cover up all the wires and stuff and provide a concealed surface to mount a battery pack in.