My U. sikorae

So I am setting up a naturalistic enclosure for my leaf tail. My ultimate hope is to get a female or two I can put in there with him.

This is the first time I'm attempting to build a background and plan on using great stuff. I have a few questions right now (I'm sure I will have many many more as I really start getting into this)

First, I only plan on using the clay balls as a drainage layer, no false bottom, what is the best way to set that up to allow me access to "drain" the drainage layer. I bought an exo-terra and it was rather expensive so if I can avoid drilling a hole I'd much prefer it.

Second, what is the best way to secure the branches to the sides of the enclosure? Should I use silicon to secure them in place before applying great stuff or will the great stuff be enough to hold them in place?

Third, anyone out there who has natural enclosures for leaf tails, what are some good plants I can use? I want to start tracking down plants now so by the time I have the background done I can throw it all together.