Is it safe from a structural standpoint to put small notches ( 1 inch deep x 3 1/2 in long at the deepest/longest point, not the whole area) in 5ea of the 2x6 bottom chords across attic area that run from front of house to back of house to allow wires running though the area to lay so i can put plywood pieces down and use area as storage and not have the plywood sitting on wires?