I'm surprised you haven't yet received your book though it took a while (year) longer than the projected Kickstarted delivery date to receive mine (November '17).
I had him make a dozen shirts for my buddy Jim Ansite for Christmas and was a bit skeptical of a timely delivery but he had them to me in 2 weeks.
Jim has been trying to get some more made for friends and has had the same problem you're having, no reply to messages/calls.
Dwight's a gifted artist but like many of us do, stretches himself too thin with too many projects. Send him an Instagram message, it might work...