I got around to putting it together tonight, took only a few hours to get it to work but it needs some tweaking.
Since it would have ended up being more expensive to buy the parts separately and time consuming I ended up just going with a kit. www.hiviz.com/kits/kits.htm It was about $25 with shipping for a sound trigger and delay unit.
Here's a super quick test shot, seemed to work pretty well. "doesn't work with water droplets, only sharp sounds it seems like"
well I know there is a way to set it up through a old tape player, but then idk how you'd set up a delay unit with that. The piezo should be for all things exploding or breaking in general and a photogate type trigger would be better for water droplets anyways. So that's my standz
I think it's possible, I didn't see any info on how nikon triggers work but with canon it looks like it's just a simple on off type deal. Which I don't think would be super hard to add in. There wouldn't be af though.