I like the idea of a fluff book with lots of art... I'm also thinking in a card based tavern brawl game and a construct arena game that might be with miniatures (that can be added as alternative constructs) or maybe could also work as a card based game. But imagine a customizable plastic kit where you can build one large construct, 2 medium and 4 small ones as your arena team, to battle your opponent in 30-45 minutes with minimum set up or maybe a small 45cm x 45cm board so it can be easily transported with minimum hassle.
Andres