Firstly, the plans say "You may wish to back the joint of panels 1 and 2 with a 2-inch wide piece of plywood." The Sketchup view shows this plywood strip on the "outside/large angle" of the joint. Will it be ok to to place it on the "inside/short angle" of the joint? ...located like the dark strip of wood seen in the picture below?

Secondly, I can find nowhere in the plans stating to put screws in the "vertical" dimension of the panels where possible. I'm thinking this is so obvious it goes with out saying.... but just to clarify... Is it best to put several screws through panel 4 in to the vertical (as seen below) ends of panels 1 and 3?

Finally, the panel 5 brace is described as needing half-round relieves to preclude interference with the driver surround during long excursions. This doesn't seem necessary as the driver surround isn't lossy or large enough to allow excursion out that far.
Any comment is greatly appreciated. I came here looking for diy PA speaker plans and turns out to be a whole educational experience on the finer points of sound reinforcement done correctly.
What a cool cool site and forum. Thanks to everyone involved for posting and sharing so much excellent invaluable information, Rickisan