On connectors, might try www.peigeniisis.com . I like Canon- ITT K series.
Use a 7805 V reg with 1000 uF on input & .1 uF on output. Have you considered keeping relays close to lihgt pole, & run long control lines. I would then use a long terminal strip & spade lugs. I have no good plug suggestion.
by Duane Benson
by Jake Hertz
by Jake Hertz