Hello and welcome to the frog forum !
Biotopes can be quite difficult to set up. I have exactly 0 experience with setting them up. But Bill (derangedchipmunk) will be able to help.
The height is quite restrictive. You will be loosing about 5-6 inches when you have a properly layered substrate. That only leaves you 6-7 inches of height. That kind of height really isnt sufficient for most frogs from that part of the world. I would definitely look into a tank with more height involved. (IMO, a 24x18x24 exo-terra terrarium provides the perfect balance of floor space and height).