When I was looking at it I was thinking a wooden top with a hinged door to let you have access to the inside of the res. I had no intent of leaving an explosed res :P
But yes a lid would be the first priority with it. A painted sheet of plywood or OSB with perhaps a 2x3 runner or two along the top to prevent drooping would be more than adiquate for it. A couple hinges and a handle and you are set :P
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