How about something like this:

This is just a sample. I know you want the dimensions/orientation different. Not a problem. I created the film strip in 3D Studio Max, so it can be resizes, bent, twisted, curled, whatever-ed, however you like. Also, if you need the images
on the film strip I can send you the texture, you can paste the images into the cells and then I can re-render the film strip so they are all there in proper perspective. That way you don't have to "fit" the pictures into the cells using photoshop.I can also render it at any size and with an alpha channel so that the strip itself can be composited onto any image easily.
Good?
~Mike