Or i reckon you could blend some cashews into some sort milk to thicken it, probably it'd even taste nicer than tofu. Blended silken tofu isn't really that thick. I don't have the book :( but you might be able to just use coconut milk (or whatever) and slightly increase a thickening ingredient in the recipe (agar, starch et al)
For quiche try chickpea flour, like this
http://bittersweetblog.wordpress.com/2010/05/24/real-vegans-eat-quiche/