I just got a book from the library called The Chinese Vegan Kitchen, and it has some Szechuan stuff. Lots of other good stuff too, I just made Moo Shu Vegetables tonight.
This is the amazon page: https://www.amazon.com/Chinese-Vegan-Kitchen-Meat-free-Dairy-free/dp/0399537708/ref=sr_1_1?ie=UTF8&qid=1505904065&sr=8-1&keywords=chinese+vegan