I'd like to grow a ficus bonsai tree since it's my first time doing any type of gardening on my own.. not quite sure how much size I should be giving for the plant to grow. I plan on growing it in my room and have started planning out a crafting project so that I can create my own growing box. I'll be making a wooden box which I will decorate the outside of, but would like some suggestions on dimensions.. thanks in advance for any advice!