first build, lots to learn and figure out, had a friend with a metal fab shop cut out this aluminum plate, it fits right over the frame rails, thinking of very shallow rubber bumpers under it (like stocker, only much shorter), make hook underneath to grab the cross member up front, bolt through the rear cross member, pre-drill tiny holes all around the perimeter to accept rivets as a means to attach vinyl, high density foam in layers, shaped. plan or stupid? I will eventually bend the aluminum to follow the contours of the frame closer.