Here's a fourth gen Accord. When searching for blueprints it helps to use the chassis code (CB in this case), which can be found on Wikipedia.
http://carblueprints.info/blueprints...d_cb3_1989.png
In Photoshop, put the template on a layer above the car and in the Layers tab in the drop down menu change "normal" to "multiply". This will essentially remove all white tints from the image, making it see-through.
If you print this out large it would be very easy to scale it up to full size with some drafting tools, since it includes dimensions
Oh, and that Riv blueprint may not exist online so here is one from a photo. It's okay... I wouldn't be surprised if there were no separation on the roof.