Hm, this is a pretty interesting idea. The merging of a bit of fanfic with actual gameplay footage. Recently I have also come up with the idea of taking some screenshots from my playthrough of several Freespace campaigns, but I took a lot less of them, about one, two from a mission, since I saw the usage of them mostly in loading screens or for an eyecandy in the download sites of the respective campaigns.
http://www.hard-light.net/forums/index.php?topic=92316.msg1824482#msg1824482If you want to use some of them, go on. I could actually help you a bit with taking them - since I am already on it...
By the way, I am strongly suggesting running the latest Nightly build of FSO to take screens (at least of 23rd June I think). The new PBR effects merged into the game engine are gorgeous.