I'll second that. It's a great book, and along with Dan Rahmel's Nuts and Bolts Filmmaking you can build alot of your own gear. My only gripe about the dolly in Dan Selakovich's book is that I prefer using a right angle bracket with the wheels perpendicular to each other. I think it makes the dolly more stable on the track. I built it the way he did in the book, and I get occasional problems with the dolly slipping off. It's usually not a problem, and I may have just screwed it up myself.