It's nice to hear that the modding tool is right in the way! And thinking about it a little question has came to my mind: will the modding update allow the users to change the base game? For example, I suppose that someone would want to change Tim Timster and Luis names and portraits for ones more similar to the real Tintin and Snowy. It would be possible to do that or the modding tool will be only for adding new content and not changing the one already in the game?
And about the book, I'm really surprised by how fast you have finished it! Which by the way, I think that it would be interesting to add a chapter or two about the adaptation and the design of the board game, the creation of the music and the sound effects, the inspirations real or fictitious for the game, and about the gameplay decisions, including the creation of items, perks, companions... and combat, of course. Well, I would at least be interested in reading that. Am I asking too much? Well, I suposse that there's no harm in asking
And lastly, if you are considering to make a kickstarter for the boardgame and/or the book, you should consider adding some strecht goals related to the videogame, maybe adding extra characters, locations, items or something like that. After all, the target of both products are the same
