I would think so. But for a 30L, you might just want to make a custom one that would fit flush behind the tank and run the entire lenght of it.
My boss did this with his 18g half-round tank. He gave the measurements to John at Global, who placed the order with universal. I think it took about a month, but he ended up with a custom glass fuge that fits the back of his tank perfectly for about $30.
Depends on how much time you've got, and what you want to do with it.
He has several egg-crate trays for filter media, and a space for a skimmer in his.
B