I recently happened to come across a copy of this book at a recent Woodworking show, so I bought it since I have the same 1 & 2 volumes that you have.

It has a discussion early on about the sizes of different parts of people (legs, backs, butts, etc). The rest of the book describes 18 furniture projects that Frid has built and gives a _little_ of his thinking behind them. General plans are included but they aren't blueprints. Or maybe they are more like blueprints and less like plans (probably, I digress).

A buddy of mine who has just designed and built a real neat curved side table has been taking inspiration from Krenov via book. My bud says that his books are more conceptual, more about design theory than actually pragmatic design.

I am starting to guess that Frid is the pragmatist and Krenov is more the conceptualist.

For me, since the Frid #3 is on the rec.ww booklist, and 1 & 2 are good, it's worth buying if you can find it. But Krenov is also worth consideration as well. (I'm kinda suprised he isn't on the FAQ book list).

Here is the rec.ww FAQ book list: http://www.robson.org/woodfaq/woodfaq_8.html