Looks good but seems overkill and adds unnecessary weight. Usually you just want to use a mastic (dynamat, fatmat, etc.) on each piece of sheet metal to dampen vibrations and prevent the panel from resonating. Just a piece in the center is usually enough to dampen it. Then install mass loaded vinyl (MLV) to block sound waves from the outside. Try to make sure there are no gaps in the MLV that sound can leak through. Then finally add an absorption layer on top such as jute pad, foam, etc to absorb leaked sound and interior echoes. Here is a
good website for more information.