I think this tutorial might work for what you need, although they're not using a shower door: https://www.youtube.com/watch?v=aAinBwynsA4
They make barn door hardware for glass doors. Will they be tall enough? Barn doors need to be at least 6 inches taller than the opening for mounting.
I remember a recent project using glass doors, but didn't save it. If you search "doors" or "barn door" here on the site you will find some excellent projects!
Thanks everyone, there was a particular DIY someone had done in Hometalk. I found it!