Hey all, this is Kurt, editor-in-chief of HG101, publisher of this book, and author of approximately 85% of its content. So if you have any beefs, they'd probably be with me.
60# stock. I wish there was an option for thicker paper, but the printer doesn't offer it.
Ideally, if this does well enough, then I'd put the profits towards a regular print house (as opposed to print-on-demand). I'm not sure of what the demand for something like this is, so I wasn't entirely comfortable with maxing out all of my credit cards and potentially having hundreds of overstock sitting on my house.