Actually, my daughter and I did something like this a few years ago. First we looked to see if we had any marbles (we found a few – I haven’t lost them all yet). Next we went out to the garage and scavenged stuff. We found some clothes hangers, the leg of a baby doll, duct tape, a length of dishwasher hose, a spool of thread, some string, a spoon and several other things.
We put it all together so that when you pulled a string (as if you were going to ring an old fashioned door buzzer), a marble was released to run down the dishwasher hose. At the bottom of the hose it hit the bowl of the spoon, which flew up to whack the doll leg, which then kicked yet another marble into a plastic funnel and then dropped it onto a bicycle bell, which made our dog start barking.
She called it a visitor alert system and she got an A.
With your stash of stuff it sounds as if you are on your way to Goldbergism. Just keep fiddling with your stuff and see where it takes you.