That set up looks like it would work pretty good. Also, you don't have to have the reservoir set in the middle...I think that it would look more natural at a different part of the tank. I would also find a way to run the tubing for the waterfall so that it can not be seen , or at least put some foliage that may hide it. Just a couple ideas...good luck on the cage, and don't rush into it.
-----
http://f2.pg.photos.yahoo.com/ph/dubaliscous/lst?.dir=/Pablo(Picasso panther chameleon)&.src=ph&.order=&.view=t&.done=http://f2.pg.photos.yahoo.com/
1.0 Picasso panther chameleon (Pablo)
0.1 Bearder Dragons (Mic Dundee)
0.1 Red-eyed tree frogs
1.0 African side-necked mud turtle (Wrinkles Jr.)
0.0.2 D. Tinctorius (Cobalt V.) Dart Frog