Good luck. In my experience all content management systems suck. The problem space is huge and the range of complexity is enormous. This means that any given CMS is unlikely to be a good fit for a particular site - it'll be too simple or too complex in any number of ways. The challenge is to create one that sucks as little as possible for the particular site you're trying to support.

But don't listen to anyone telling you you're not building a content management system just because you're skipping some of the usual building blocks. Of course you are! You've got content and you're going to find a way to manage it. You might do a bad job (by, for example, skipping databases and templates) but it will still be a CMS when you're done.

-sam