Neato Dorito! However, the OCD in me is pinging; as your right edge is only 2 coins in width, while the left edge is 3 coins in width. I would have started at the center and worked my way to the walls. Baseboard and/or shoe would cover the gaps. That stated, I'm the one with OCD. Ignore me. I still think it looks awesome.
Also add a tiny terracotta Lincoln inside the memorial....and do one on a moveable board with another type coin even, display throughout the household....you've made it easy for p98 who will come many years from now to detect this very site after you and yours have gone into history ....imagine the threads and videos (holograms?) then...!
Some other interesting floor https://www-newsweek-com.cdn.ampproject.org/v/s/www.newsweek.com/woman-spend-16-hours-gluing-77-worth-pennies-floor-1598174?amp_js_v=a6&_gsa=1&=1#referrer=https://www.google.com&_tf=From %1$s&share=https://www.newsweek.com/woman-spend-16-hours-gluing-77-worth-pennies-floor-1598174