The thing I choose first is the size of the top of the chest which designates each size of the sides. The top is 9.25″ x 6.75″ ; thus each side will be those said lengths. Now I will choose the height of chest and how large I want the bottom have versus the top half. Have to be very cognizant of where the eyeballs are. But the percentage of people who are watching on TV versus on their phone…