I read the original LCK article on Rosenfelder's website years ago and it opened up an entire world to me of constructed languages and how to go about them systematically. Years later, I own all three of his "Construction Kit" books and when I saw this posted on his website, I figured that a dollar wasn't too bad. It's really not worth it, though. You could easily get the same experience taking that section of his website and converting it to a PDF to read on your phone.
That said, it's still good information, thus why I have a somewhat mixed set of stars for my review. It's a good article, but you're better off getting it from his website.