On every site previous, there has been a whole post of usefull information involving subwoofer enclosures.
I couldn't find one here anywhere, and it looks like there are some people who could use some advice.
Here's my biggest tip: Go easy on the screws and let the wood glue do it's job. I don't approve of staples or nail guns, cuz you still need a little support, but when you put the screws within 2" of each-other (I like at least 3-4" spaced) and the same amount at end of the joint, you are more likely to split the wood and weaken the joint tremendously.
Now, this isn't the best box in the world, but I can explain with a picture of mine.
(If it looks a little different from most audio shop boxes, it's because I double-baffled it.)
3-4" between screws and no closer than 3" to the end of the joint.
If this is a needed post, it would be cool for the professionals to hand out some needed tips for the apprentice box builder.
If it's not needed or in the wrong subforum, then I won't be sad to see it die.