First of all, it's great that you dedicate so much time and effort in creating a good terrarium for the frogs, both research -and feedback wise.

You can find several pictures of my red eye tank in my album, however the pictures are slightly outdated. Just imagine even more leaves of the pothos and you pretty much know how it looks like now:
ViperJr's Album: Agalychnis callidryas
I'm not sure how I can help you, so I'm just going to explain how I setup up everything and hope that something is usefull.

The substrate is three layered, starting with a drainage layer of aquarium gravel (however, I really recommend using LECA instead. It does the same thing, but it's much more lightweight. According to View Profile: SludgeMunkey - Frog Forum, aquarium gravel is also more prone to anaerobic bacterias). The middle layer consist of coco husk and on top of that, sphagnum moss. In other to make the drainage layer actually drain "water", I have an UTH (on a dimmer) covering some of the bottom. This heats the gravel, and the water evaporizes, without raising the ambient temperature (or even the temperature of the top layer, barely even the coco husk). This works great since I use a ReptiFogger to maintain humidity (thus gently moisting the substrate). It would probably be worthless if a real mister was used, since then it would be an actual layer water on the bottom of the tank. It's also risky to heat aquarium glass with an UTH if there's water above it, since can make the bottom crack.

I have 4 T-rex vines in there, which are sometimes used for climbing by the frogs, but mostly they're in there to make the pothoses (Epipremnum aureum) climb. As you can see in the pictures, the vine in the front of the tank are covered with pothos. And if I took a picture right now, you probably would have a hard time actually seeing the vine, since the pothos are all over it. The pothoses themselves are planted in different ways:
Two of them are planted in coconut pots, which are siliconed to the sides of the tank, quite high up. This turned out great, since they both grew upwards against the light, but also downwards towards the substrate. They actually are now roted in the substrate as well, and grew across the tank, then started to climb upwards again when they ran into the wall. Never underestimate the power of the pothos!
Two other, smaller pothoses are just growing purly epithytically. I cut the pieces I wanted and placed them in the middle of the tank, supported by other pothos branches and vines.
In terms of watering, the pothoses get all the water they need from the fogger, since they are epithytical (as well as they can be planted in soil, or directly in water).

I also have a snake plant (Sansevieria trifasciata), and a Dieffenbachia, which are both planted in pots, which are hidden in the substrates. The Dieffenbachia requires watering about 1-2 times a week, but the snake plant can go much much longer without water. In the wild, this plant can go through winter with just a few waterings during the whole period.

I use a pre-made corner waterfall as a water source (I think the brand is Namiba terra) which works great. The only downside is that it makes water changes more difficult than a regular waterbowl, since it's hard to remove it (in my case, it's almost impossible since the plants are everywhere. I would need to remove and/or destroy quite alot of the pothoses to get ut out). I use a aquarium tube to siphon the water and, when needed, just clean it while still in the tank.

I think that's about it, at least that's what even remotely intresting. If you want to know something else about the tank that you think will help you, please let me know. Also, I just got out of bed and is headed for work, so please bare with me on the bad english. Tired+stressed is not the best combination, when it comes to write properly in a foreign language!