Damon,
The spots are looking good! Very vintage.
I was shooting for the same kind of feel with the Lounge set (your sample set is in the mail as of Tuesday AM). I flipped through the photos in the Campiglia & Wells guide, but the photos here:
Nevada Chip Pictures
also helped. You need to pay attention to the years the casino was open, as well as the overall "look" of the chip too.
Regardless, I think you are on the right track. Solids, 214, 314 and the occasional 414 and half pie are spot on. Probably pretty thin on DG colors too.
Good luck with this. A great theme and feeling to go for. Totally classic! Keep up posted!