If my hypothetical recipient requested the "Crafts and Games - Card/Board Game" freeform, would it be acceptable for me to take an existing game and create a version of it specific to the fandom we matched on? For example, could I make something like a "The Witcher" themed game of Monopoly, or a deck of "due South" themed Fluxx cards, or a create the files necessary for someone to 3D print all the pieces of a "Hannibal" themed chess set (not that I have the skills to pull off the last example, but maybe somebody who does have the necessary skills might want to try)? Or would I be expected to create an entirely new game with its own unique rules and mechanics of play?

And speaking of things like 3D printable files, what do you suggest participants do for anonymously hosting any type of works which cannot be kept directly on AO3 or uploaded to a free image hosting site?