Building a copper and wood coaster holder

I was asked to collaborate on a giveaway prize for James Howards (@hashtagwoodworking) 1k followers competition and this is how I made the coaster holder for everyone's custom coaster.

At the time of posting this (10 December 2019) the competition was still live so go and enter on James' instagram post:
https://www.instagram.com/p/B5SWhZcATtU/

The other great makers involved are below. Check them out and their awesome work:
@Spiritandbear (Kez and Phil)- https://www.instagram.com/spiritandbear/
@ae_woodwork (Adam Evans) - https://www.instagram.com/ae_woodwork/
@olliegapper (Ollie Gapper) - https://www.instagram.com/olliegapper/