At this link you will see some of a drainage system I set up. It is nice to look at because it gives you a chance to think about parameters of a drainage layer.
Split Face Poison Dart Frog Vivarium
This is sort of a no compromises drainage layer.
It tries to keep things light with the use of a false bottom.
However a false bottom and most synthetic materials are ugly, so it covers those up with a light stone around the outsides. Then you can often see different layers of substrate and possibly screen which is also ugly so it creates a wall to allow the drainage material to go all the way up to the same level as the substrate. Then you just fill the middle with substrate.
At the end of the day any system will work fine as I have used many, what you are really playing with is how good do you want it to look and how much work are you willing to put into making it look good. And balancing that all with weight.