A DPDT (Double Pole Double Throw) switch allows two completely separate circuits to be controlled by just one switch....
Most modellers tend to underestimate the size of trees. Obviously, the size will depend on the tree but oaks can grow to 30 to 40m (that is 100ft tall), pine trees are 50 to 60m (200ft tall) and beech trees are 12 to 18m (40 to 60ft tall)....