Hey thanks!! Super fun project and pretty cheap too.
I took a laminated pine board and cut it to the size of bar I wanted - you could use plywood, whatever. Stained it ebony so the pennys would “pop”. I used a penny’s diameter of .75” to figure out my dimensions so I wouldn’t end up with any gaps. Built a frame around the outside out of 1x3 Douglas Fir and sealed all of the edges using wood glue. I made a lip that was approximately 4 Pennys high, think that’s all up to personal choice and how deep of epoxy you’re going to pour. After that, it was gluing each penny down using contact cement, painting on a seal coat of epoxy, and then pouring a deeper coat (I went approximately 1/8” deep) and letting it cure. Slapped on some trim and threw an LED strip underneath it and there ya go!
Lots of info on the internet if you want to try it. All in I doubt I was over $150 - including the LEDs. Amazon was the source for the epoxy and the Govee LED strip. Everything else the good ‘ol Home Depot.