Re: your laser sensors, would these require a sending and receiving unit? Would it not be possible to have your lasers incorporate a reflection device that would indicate a "go- no go" and depending on how you set the switching (SpSt No or Spst NC) configuration have the circuit either made or broken at your logic unit? Are you thinking of a RC circuit to read the sensors and the same to trigger the camera(s) or are you considering RC on only the camera(s)?