#4 Are DCNotes difficult / costly to produce ?

No, they are neither difficult nor expensive.

in contrast to the ›original DC art project DCNotes are fast and easy.
creating your digital Master Image (MI) is a matter of days or even hours. once you have the MI file it is easy to produce your own DCNotes, all you need is a black and white laser printer and paper stock of your choice. another option is that your DCNotes are ordered from this web site, produced and send on demand to the buyers/distributors, while you get the revenue.

regarding cost - from about about 50-60 units of your chosen currency (EUR, USD, GBP).

DCN system is using standard technology, standard formats and materials - available just about anywhere on this planet (Earth).