Hard to believe that no one answered Dustins post so long ago.
Maybe the ansewer seemed too obvious to some.
I just always run cleats top to bottom and near a corner I always put an extra screw into the cleats to help secure the corner as the top is installed.
Call it overkill if you like, but I don't have air leaks, even when rolling the tone generator down to 5Hz or so and dumping a couple of hundred watts into the drivers.
Yes, even though I found WO plans when they were offered for free as a promotional item, I still bought Steve's plans over the years.
I have built many of these Wicked Ones and even upscaled them to use 18" drivers for club use. Still one of the most versatile and best designs out there.
I only built them for my own amusement mainly, but I have also helped out a few special friends along the way with bands getting going.
Never really made a penny doing so, but that was not the point of my quest to help friends.
My re-up, using mid grade 18"ers cost less than $800 per pair to build and, except for a KW or so amplifier and adequate XO they were in business with the difficult part of house sound.
Then My Buddies could ROCK any club in the area with jaw dropping bass.
I still have the flat, 8-up 4" version sitting in the corner, unused for years.
Not sure why interest in the WO has dropped off so dramatically. But then, I'm still an old dried up, half deaf, recovering concert sound guy.