the little I know about making boxes is that its all about the area inside the box and less about the shape. Keep it simple. The edges do need to be sealed and there are a few different little mods you can make to the box to change the sound (stuffing, etc.). You'd probably be better off reading up on this in another forum like www.sounddomain.com or .net, can't remember which it is.
I believe ported boxes if tuned properly give you more explosiveness to the sound, but closed boxes make the sound more full, something along those lines.