Core body midsections soldered together & lighted rotary switch installed.
I cut the inner core copper tube to accomodate an 18350 cell, applied solder paste with toothpicks & made neat with cottonbuds, held positioned parts with grips and used dual jetflame lighter to flow switch board surround in place.
Same technique with the mid section spacer and front o-ring stop.
The slim 1mm gaps are where the rubber o-rings will sit, one for the head unit water resistance and one for keeping the rotary tail smooth in action.
Solid copper wire poked through vias, bent in place and soldered. Copper disc added to centre of ring magnet with JB weld, rebuilt switch temporarily for fitment and magnet strength test.
Modified a little and soldered the bottom contact board into the battery tube with copper pins drilled through the tube into the board, soldered and filed flat.
Top contact board with traces etched in using the same methods as before, resistors & 1206 green LEDs installed.
Each LED has it's own 1206 2kΩ resistor fed by a 1k bleeder resistor bridging the positive contact on the pill to the copper body core.
Soldered top contact disc into rotating copper shell end piece, this unit is now held onto the main body with M4 brass nuts securing to the 4mm brass bolt in the bottom contact board.
The rotating copper shell unit will be fixed to the finished outer flashlight body tail section.
Quick test: :THUMBS-UP: 
I installed a temporary XP-G2 emitter along with the old reflector just to get things up & running to check the operation.
The tail LEDs work as most lighted switch setups do, remaining lit until a mode is selected by rotating the end tube section.