I like the hardscape. I love a hardscape that stands out in a planted tank. I love that wood, and I think it looks great with the rocks in that formation.
Are you planning on having the cracks in the rocks filled with sand or basically this sitting ontop of the substrate?
I think it would look cool to have the rocks filled in with sand, so that some rocks are half covered, while others are more exposed.
Either way, it looks good; look forward to seeing that manzanita in the tank.