Although, really, there's nothing preventing someone to currently post info on their biotope set-up in one of the pre-established forums (Planted Tanks, African Cichlids, Brackish fish, DIY...)
When I was trying to get my Rio Tapajos tank started, it seemed there was a general surfeit of *specific* biotope information on the 'net. Unless you wanted a Rift Lake Tank (see African Cichlids) or a generic Amazon tank, there just doesn't seem to be much to go on. Mongobay was of assistance for species, but not so great for decor. What really helped out was doing lots of broader biotope searches without referencing a specific area.... *blah, blah, blah, insert long-winded post here*
summary of where I want to go with this: if you want to build a biotope, then read things posted about biotopes in addition to the one you already have in mind. its easier to learn the theory behind building a biotope than it is to find a recipe.
(also, i think that "biotope" should just be added to Planted Tanks: "Plants, Planted Tanks and Biotopes")