i'm currently building one as well. I'm doing 1/3 land and 2/3 water with the glass divider in the middle. I got a small piece of plexi from home depot and cut to size. The water will be about 4 inches deep with a pump/filter to help keep it clean. I have been picking up river rock from the local stream to place in different sections for lots of different depths. For plants on the upside, i have a pothos ivy in a small container for a corner and a Nepthythis for the other side. both plants don't mind being wet. i'll put a few more big rocks for them to hang on, and a branch or two for them to climb on.
Pothos
Nepthythis
