I have heard that before, and my wife would do crossword puzzles for that reason. In your other post, you metnioned that you currently find youself single. That is too bad because a woman is the most puzzleing thing I have ever encountered. I have been working on solving the puzzle (which is my wife) for twenty years now, and I still have not figured her out.
Creating puzzles is also a good way to keep yoru mind sharp, which brings me to my next question. When do we get to see the final puzzle cabinet? I know that you were planning of modifying the original a bit.
Before tackling the next cabinet, I'm taking some time to rearrange and tune up my shop. Right now building a quick roll-around cart to stash all the layout tools and odds and ends I am constantly moving from one flat surface to another; tuning up the jointer (knife-set), planer (roller pressure); building a torsion-box for flat assembly; moving the router table; maybe even building one of the famous John White "new-fangled workbenchs", since I don't really have a good bench and this one looks not only inexpensive, but handy--(http://www.taunton.com/finewoodworking/ProjectsAndDesign/ProjectsAndDesignPDF.aspx?id=2625
As for the wife puzzle, you are absolutely right! But after three tries I decided I better get to some other stuff, like cabinets and puzzle-boxes, before it was too late. So I'm on an extended sabbatical from marriage. I do have a great German Shepherd, though, who rarely argues with me and thinks most of what I do is pretty great!