To be honest, I have purchased the "ukulele design and construction" by D. Henry Wickham, and to say the least, was NOT satisfied with it, of course, that's probably what I get for buying a book about ukulele making that's made by a guy who's ukes I haven't heard of.
edit: that's not to say that I haven't found the book at all useful, some of the jigs I'm building right now for my next soprano are from this book. But to be weighed against the poorly written qualities of this book, as well as the many typos and how "incomplete" it is, I must say not to get it. It seems to treat it like a cookbook, just mix this in with that, and as long as you have the right stuff, it'll turn out, and from the advice I had recieved from some people (one of them being a luthier for classical guitars, as well as a few uke builders) seems to be the opposite: what it's made of, while still important for stability and ease of workability, is not nearly as important as good craftsmanship and how its made.