I think a bespoke piece is definitely doable. I could actually go a bit more on both: why did I make the choices I did for banknotes (especially, for example, for Ilia, which is one of the more recently-completed series I did) and on how I design banknotes. I know I've been meaning to do the latter, even though my process is a bit hard to really describe (it feels), but I'll try to go through at least the former. Because encyclopedic content for something like this doesn't seem the easiest...