Looking good. You'll probably have to change your water out several times. Personally, I would soak the wood in a bucket and cure the concrete without filling the tank up with water. When I did my rock wall - albeit in a terrarium but should still apply - I used vinegar in a spray bottle several times to "cure it" and then I sprayed it with water several times a day until the runoff reached a neutral pH. Sounds like you've already done a bit of this, so it should be easy. Of course, I have a python to help with the water part. Anyway, It looks very good. It would go well with large plants and large fish because the striations are so big. Smaller striations would look better if you want to "miniaturize" the aquascape - just FIY.