What a fantastic tank! It's huge and I love the current balance you've achieved between the hardscape areas and the pale substrate area at the front - just beautiful. I think the scape looks really natural with a nice mix of the rock work and some nice pieces of branching bog wood. The question about the tree is an interesting one; in some ways isn't trying to recreate nature a central tenet of the natural planted tank, particularly the Amano inspired themes. We use rocks to mimic moutain ranges and drift wood to emulate tree roots and so on. However, while I feel these artificial trees are inovative and can look really dramatic, for some reason I actually feel they're at odds with the natural theme many of us are trying to achieve. Whatever you decide to do with this tank, I'll say it's stunning and what a fantastic place for your fish to inhabit. If I was to be hyper-critical I would say lose the tree and utilise the pelia on another piece of drift wood.
Very unusual, huge, inspirational tank, thanks for sharing, do keep us posted