I built my 4411 clones from furniture grade plywood on the sides, bottom and top, MDF for the baffle and the rear. I used a 5 inch PVC coupler from and electrical supply house for the midrange chamber, at 85 cu inches it was ideal. I routed the drivers into the baffle board and rather than set the baffle board into rabbit joints cut into the sides, I had the baffle cover the ends of the sides. THis looked a lot better than painting the ends of the sides like the originals.