Rick R posted:...Hey Stan 2004 I like this and so does my son Likes this system. Can you send me a drawing from bricks to optocoupler? If its not to much trouble. Need to peel onion a little more, Thx for your help
Are you saying you're going to dive into the deep-end of DIY component assembly, soldering, etc.?! 
The connection(s) from each brick to the optocoupler is thru a ~5-cent resistor and possibly a ~15-cent screw-terminal connector to make wiring neat. I would mount the components on a ~50-cent prototyping board as illustrated above. As mentioned above, if using the optocoupler it appears cheaper to buy 4 1-channel optocouplers (~25 cents each) than 1 4-channel optocoupler. The behavior will be identical.
Note that you can use this optocoupler method to drive the IOT relay widget you bought too. As I've mentioned before it all comes down to EXACTLY what features you want - for example over-ride switches, status lights, and so on. You said you want what Clem has; I appreciate that but we really don't know exactly what Clem has and I'm not the guy that will ask him to dis-assemble his system, take photos, etc.
