vivarium project

i decided to change my design for the vivarium project. i made a model volcanic island out of foam and cardboard but the mountain obscures so much of the island that it would ruin the miniature landscape look i would like to achieve. so i'm going with a design that will take advantage of more flat space and a waterscape along the front edge. like in this picture i found on the net.

here is what i want. i want an island surrounded by water, but i dont think i can get a terrarium big enough.

here are some more vivariums with a landscape look and waterscapes.

http://www.stormthecastle.com/terrarium/professionally-made-vivarium-terrarium.htm

i want the 30"x30"x30" sliding front terrarium by Protean Terrariums.  http://www.customglassterrariums.com/products/30%22-x-30%22-x-30%22-Cube-Terrarium.html
i can have them drill any holes that i want. the 30" cube probably has the greatest deminsions of any terrarium i can get. it will provide me with the surface area to make a living landscape while keeping a waterscape.