Thanks to @greedyintern, @RadicusScout, @dmoney, and others for the great cupholder and LED mod instructions.
https://www.pokerchipforum.com/threads/barrington-poker-table-thread.30910/post-2352520
https://www.pokerchipforum.com/threads/barrington-poker-table-thread.30910/post-2405037

Just finished mine and it turned out great thanks to those detailed instructions.

For the COB LED lights, I did make a minor change which I haven’t seen posted. In case anyone’s interested: