A few years back, my friend and I attempted to build our own Dolly out of skateboard wheels, PVC pipe, and scrap lumber. Athough we did a fairly decent job, in the end it was an unwieldy beast that weighed far too much and kept losing all of its (non-locking) nuts & bolts. How I wish we had a book like this back then.
As of 2010 you have a lot of options to buy "pro-sumer" rigs at places like B&H. However, even their basic PVC Dolly kits start at around $700. And the only real advantage it has over what my friend and I built is precision mechanics; it won't break down so easily. But still you will only have a basic Dolly Rig with limited track. You are going to need a lot more than that to shoot a Hollywood-style production. This book will enable you to build that same functional piece of equipment and many more with a solid investment of time, money, and space. For some starting filmmakers working under any kind of budget, and who want their reel to look like Sam Raimi or the Coen Brothers -- this will undoubtedly be a tempting thing to devote their time to.
On the other hand, maybe you are not that kind of filmmaker at all. Rigs will not necessarilly tell your story any better. Maybe you just need one or two dolly shots that you can carefully plan out -- in which case you can rent or improvise. Or let's say you already have a relatively well-paying job which enables you to spend several thousand dollars on a select few excellent pieces of equipment to use in a production. They will probably be more attractive and durable than some of these you construct yourself, particularly if you are not already skilled as or interested in becoming an amateur machinist.
What will you need in the way of tools, equipment, and know-how to build this stuff? The short answer: the more the better. You'll have to buy power tools, drill bits, locking pliers, combination squares, adhesives, and many other small items. Realistically this could run you hundreds of dollars and dozens of trips to Home Depot and other local hardware stores. Many of the larger projects require things like a drill press. Most of us do not have one of those. But my guess is that if you are capable of running any kind of camera the construction will be do-able -- with the proper amount of time, effort, and caution put into their fabrication.
Dan Selakovich's book provides the details that will make or break a piece of equipment. And you do not want a malfunctioning rig when shooting day arrives. "Killer Camera Rigs" is filled with 2,000 no-frills pictures that take you through every step of the process in creating mounts, pedestals, and a variety of cranes & dollies. There are some really inventive materials and set-ups. One low-angle rig makes use of a wooden billiards rack and an aluminum cane, another the foot rest of a drafting chair. The latter is to create the much-ballyhooed "Figgis Rig" which otherwise will cost you a bit of change.
One criticism I have is that hiring somebody proficient in illustration would have been nice to provide some crisp diagrams and schematics. The photos are okay but are uniformly quite dull. I also find that despite the cloying "film noir" names of each rig, there is little discussion of their overall purpose other than to imitate shots from classic films. Unfortunately, this superficial and casual tone is the norm these days in most how-to books. It's not of paramount importance in this sort of text, but readers must understand conceptually why they should or should not devote their energy to a certain project, in my opinion.
With many of these projects, you will not be able to replace pro rigs that cost thousands of dollars and were built to protect Arriflex or Panavision cameras worth tens of thousands of dollars. For instance, the basic car mount is meant only for slow moving shots and the camera used in the pictures is a lightweight Sony Handycam. I'd be very hesitant to put a Red camera on four suction cups and hitting the accelerator. So approach each individual project with skepticism and keep in mind the weight of your camera and the stress under which the mounts will be placed.
Although I do not agree with some of the testimonials that "to make great shots you need great equipment", it certainly gives you many more options if a few rigs are integrated into your tool kit. Rigs will give your shots a lot a fluidity, variation, and enable the integration of other techniques to constantly provide your audience with different visual cues. Although you can certainly shoot a film entirely on tripods and handheld, you probably want to spice it up just a bit if possible. And for anyone shooting music videos or anything of the sort, rigs such as these are absolutely essential; spoiled audiences almost demand wall-to-wall movement.