5 parts sounds OK, but there is no upper limit. I can tell you that in the past when users approach me with highly detailed, well-outlined plans like this, and ask how many sections it should be released in, or if it is of interest to our users, the results are always the same: The articles do very, very well. An intro article sounds fine, and I'm sure however you decide to break it up, the articles will do, very, very well.
Thanks, Sean Ewington The Code Project