Mashed it up in tinkercad. view here:
https://www.tinkercad.com/things/2375ht4nFpD-gridfinity-1x1-challenge-coin-stand
links to original models listed above.
Printed 2 on a 1x3 Gridfinity baseplate, only to realize with the 50mm coins, the coins touch and need to be spaced X_X on that particular baseplate. \_(ツ)_/
The author remixed this model.
placed coin display model on a 1x1 gridfinity base.