Fastening the microswitch was a bit tricky - No2 screws are unknown here, so I got slightly bigger ones. Also, Schrauben Preisinger seems to have a predeliction for slotted screws rather than Phillips or hex, which makes it fiddlier. Would be nice to have a slotted bit that fit over the outside of the screw, so it couldn't slide.
Splicing together the wires, I re-learned how to do a good inline splice thanks to this Instructable.
Y Motor Assembly: Since this will be under tension, I re-fastened all board connections with M4x20 screws, adding extra washers to compensate for the extra length. This ain't going nowhere now!
Z Motor Assemblies: Took some of the extra wire from the extruder motor (it has meters and meters!) and extended the left-side wiring across to the right-hand side where the electronics is. Much faster to splice now that I know what I'm doing. Also, putting on the heatshrink before stripping insulation is a lot easier. I'm still not sure which cable ties go where. I'm leaving them loose for now so I can swap them when I can see it.
Extruder Motor Assembly: Finally got the remaining screws. All fastened and good to go.
Z Axis Assembly: Added microswitch and threaded it. Almost stripped the Z markers on the home-cut end of the threaded rod. Somewhat confusing instructions on the couplings, but then my shaft has no flat. Everything of this now mounted and tightened.
Y Carriage Assembly: Got the last two LM10UUs in. Slightly funny that the bearing holders have slots instead of nut traps, maybe that's just an older version. Using M3x20 in general since my M3x16s are slotted. Doesn't look like it'll affect anything.
Print Bed Assembly: Stripped and soldered on the 26-way flat cable. Stripping worked incredibly well with this little snipper - notice the flat piece of metal along one edge.
This one is a Knipex 78 71 125. I may need to get one of my own.
The 2x12 twisted-together pieces need to join with the 32/0.2 red/black wires. I don't even know that designation. It's 0.2mm copper (sensibly) overall diameter 2.5mm. I guess the 32 is strands. Need 635/620 mm of these. I guess another trip to Conrad is in order. My time here tonight is up, anyway.