I bought some black plastic clips from Home Depot that I needed anyway - for $10 - then I hacksawed a small strip of the black plastic off of one of them. Using a photograph (from ebay) of the N80 back, I used the plastic strip to fashion two small pieces of plastic to replace the broken tabs, and superglued them in place. Presto: The camera has been working flawlessly.
I only paid $5 for the N80 body in the first place, because of the broken latches. I bought a second one with broken latches and plan to do the same. The N80/F80 is a real neat camera - if you use autofocus lenses it has most all of the F100's features that are important to me.