@everywhereist @simon well since you ask I'm working on a book which I crowdfunded in November. It's using an upgraded pen and paper gaming system to create conceptual tools to incorporate the concept of vehicles into a fantasy RPG.

It's quite niche but I like it. My previous work is about bringing nature vs nurture to a setting (see profile). It's because in D&D you can't make a character from Pratchett's "Guards! Guards!" But now you can.