Once I had the vivarium situated in its permanent location I cut a piece of weed block fabric to size and got it under the wood.
I then back filled under the fabric with LECA. It would have been impossible to get the fabric under the lowest projections of the wood after the drainage layer was in place. This is why I had to put the fabric and LECA in what would normally be a counter productive order.
I did leave an area free of LECA to act as a pond for both aesthetics and practicality of draining excess water. I filled this depression with gravel and used gravel around the perimeter of the folded over fabric to hold it in place as I added substrate.
The substrate mix is loosely based on ABG mix.
Once the substrate was added I misted the tank down and started placing bromeliads.
I am going to a reptile show tomorrow and might buy some more bromeliads there depending on what is available. I still need to add terrestrial plants, microfauna and then leaf litter. I won't be adding any more epiphytes until the wood has absorbed enough moisture that it won't be pulling moisture away from the plants.