Do you still have the link to the viv you are thinking of? More sources of inspiration are always a good thing.
I understand that Flevopol is a cement binder available in europe. I find it amusing that a google search for "Flevopol" the first bunch of links have to do with making vivariums and nothing to do with its original usage (It might just be these are the highest ranked english language pages with Flevopol). This looked interesting for fake trees:
http://www.bbrock.frognet.org/Making... and vines.pdf
Though a chainsaw to tackle the roots of trees that fell over after a windstorm seems easier.
This is one of the most awesome fake rock backgrounds I've seen if you have any interest in that approach:
http://www.dendroboard.com/forum/members-frogs-vivariums/22002-60-gallon-construction.html
just to add more options for you![]()