I'd like to thank you for your help regarding the info I was seeking about the diameters of pennies and cents throughout the world. With your help, I gathered all the info I needed and I decided to make some foxholes with a 22mm width, in order to fit every possible penny of the world!
Below you will see two photos of the basic elements I am intending to use for my foxhole. A piece of a vinyl tile, a piece of 3mm foamcore paper and a piece of insulating foam.
At this hour, these pieces have been glued and some strips of kitchen paper are on them, waiting to dry for the next step, as you see below.
Stay tuned for the second part which will follow.
Have a great Friday night everyone!