Need ideas for supporting a floating bench
I'm building this bench for my mudroom and want it to be a floating bench. It's about 83" from wall to wall so the middle bows just a little bit. It's sturdy enough to handle my weight (160lbs) but I want to make it as sturdy as possible. Is there some sort of cross brace or something I can do in the middle without spoiling my floating look?
I can't get a photo to upload so I'll do my best to describe it for the time being. Using 2x4s I put one on each wall facing each other. I then screwed a 2x4 into the back of the wall between both end pieces. I used joist hangers to hang another 2x4 across the middle of the rectangle and then enclosed the box with a 2x4 long enough to screw into the front of each end piece. The length is 82 and 3/4" and the width off the wall is 19 and 1/2". It is 18" high. Hopefully that's enough detail to get some ideas.