Convertible currencies! A perfect example of a nerd-magnetic curiosity, and yet it somehow has evaded any constuff I can think of. Brilliant idea.

I'm afraid I may have some strong opinions about that writing system, though. It's not a good sign when each element in a featural writing system has its own postal code. Maybe try making the vertical and horizontal lines shorter? It's okay as-is for a couple of words, but that is definitely not a font you'd typeset a book in.