Yeah I know what you mean. I wouldn't say the plans are totally crap...but a bit more thought could have gone in to certain sections. I used them more as a generic guide rather than taking it word-for-word. I ended up doing several things different on my cab too...The main thing being the use of ledgers/battons. After getting feedback from the helpfuly peeps within this board I decided that
just going directly into the edge of MDF would be BAD, I'd use the alternative. There are places where I've gone into the edge of MDF 'in addition' to the ledgers ..just for extra strength. Anyhow I ended up re-drafting all the plans into AutoCAD (lol) and then rechecked all measurements about a hundred times just to ensure that everything was correct.
How did you get on with mounting your speakers in that way, I mean where there any difficulties? I've opted for some Sony XSF692N (6x9s) >>

These fit sweet...just gotta get an amp now...think I'll leave the sub for later though

Again, you've done yourself proud there with a top-notch cab!