I'm building a portfolio site for someone who wants to be able to add additional photos on an ad hoc basis. The only CMS that I have experience with is WordPress and I'm hesitant to use it as this site will be very small, only a couple of pages. Do you have any suggestions for a simple CMS to incorporate into the site which is not as file heavy as WordPress. I have some experience with PHP and MySql - how difficult would it be to build one myself?