Originally posted by MrGiggles: then use woodglue at all the seams and corners to insure a good seal, inside and outside.
actually, a proper box will use the wood glue to secure the pieces together, not the screws. the screws are just used to keep the pieces together while the adhesive sets up, and should only be used when you don't have access to a good set of clamps (like i don't at the moment... )
once the adhesive sets up, it will be much stronger than the screws.
oh, and please don't use nails.
02 Mustang GT... Tuned by Nelsons. Low 12's, anyone? 
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