I am looking to build some shelves to attach to the ceiling above my garage door for storage of seasonal items. I am looking for some help on determining the best way of attaching the shelves through the ceiling to the rafters/studs above to support a load of say 125 lbs each. Since it's going over the garage door area I can't use supports from the floor to the bottom of the shelves for this concept to work. there are 2x4's used to support the ceiling that I was going to attach the shelves to. I was considering making a frame out of 2x4's wide enough to slide a standard piece of 3/8" plywood through (I thought 3/4" would be overkill and adding unnecessary weight). I am considering attaching a header to the wall of the garage for support of the shelves to help disperse the loading of weight. Can someone provide insight as to the size of header I should use or any other recommendations to make this work?