Actually, I think it will be about like everything else. He usually is working on several things at once from different directions. My best guess is that he will use the basics of the current aquarium, and replace and reshape some items, and replace the textures with freshwater ones. It won't be a total start from scratch type of deal. With what he already has done, reshaping and replacing should take far less time than the original.
I know that he has some of the 3D background already planned out and accomplished. But please, don't take this as saying that it is right around the corner. I would suppose that even using the current basics there will be some delays with the freshwater tank, at which time he could work on the 3D background. But remember that he is only one man, and is working as hard as he can.
