Can anybody tell me what the original flooring covers were made from, if any at all in the HX sandmans, as my recent acquisition had old conveyor belt rubber cut in to cover it. (rear flooring) Did they have a carpeted plywood cover? A layer system of ply, foam or underlay and carpet? or just painted boards..need to know, It's costing me sleep (gettin too old to worry about these sorts of things)