acer freemani autumn blaze
hi all, i have 2 questions in regards to a two year old autumn blaze in my back yard. 1. how thick is it going to be once matured? why? i'm planning to build a floating deck around it and need to know how big the opening should be. 2. i would like it to have an umbrella shape instead of slim and tall. also the first branches to be about 6.5' from the ground. any ideas as to how and when it should be pruned would be appreciated. thanks so much!!