You seem to be very focused on your plants. Just don't forget to keep an eye on your ammonia and nitrite levels!
I haven't flooded the tank yet, so I don't have to worry about that yet. I'd like to have everything scaped how I want it before adding any water, so I don't have to worry about making a mess if I move plants around.
maybe turn the Mananzita around where the branchy pieces are reaching up the hill instead of going down it. I think that would look great, then you could plant between the branches and have anchor spots if you need it for the plants on that side of the hill. Also will break up the central focus of the tank and make it not so uniform from the middle