I also wanted to keep more than just a Cham, so I mounted a shelf on the window sill above our turtle pond. It drains into the pond, but solid waste has to be removed by hand. Isaac loves watching the turtles and all the fish. But I let him climb on the outside of the cage and his clumsy butt...
Cage drains into indoor turtle pond
Here's the shelf. Rear legs rest on a window sill. Front is suspended with a hanging kit that came with some leds I ordered for one of my tanks.
The legs...
The hardware...
Houses a premium veiled from fl chams. Newtons bloodline