It’s 1/4" thick. The mountains are engraved on the back – I tried the gradient thing; can’t really tell how successful I was with it, though.
The letters are engraved on the front, and then glued acrylic cutouts of the letters into the engrave for the name of the company. The smaller text was just too small to do the same, but it turned out to look better without, anyway.
I didn’t get as much glow around the letters with the light-diffusing stuff as I got with the acrylic in the Baby Gwendolyn sign, but I still like the 3D effect of the letters.
The bottom layer of acrylic has a deep engrave in it, and I mushed fairy lights into it and held them down with hot glue. The wood backing sits down in a slot just behind the lights, and the acrylic part of the sign has a slot across the bottom so it basically has “legs” at each end and fits right down on top of the lights.
I had to add the layer of black acrylic on top of the base because the lights were shining out through the teensy space between the sign and the base. It turned out better that way, though, because that allowed the sign to pressure fit so I didn’t need to try to glue the acrylic to the wood back.