screws are overrated, get an air nail gun, line the edges with wood glue, it works fine. My audio guy does the same thing. And ive never had a box spring a leak in 4 years. And he has built me 5 or 6 fiberglass boxes, along wiht the 1st place stereo install at nopi last year, and 1st and second int ehir classes escalade and tahoe at nopi as well.