for acoustics i got bryan pape to do his modeling of the room and have followed his direction. this called for 1' x 2' bass traps in the front corners made of oc703 stacked. i didn't have a turkey knife around but i used my japanese saw which worked well. a japanese saw is a very thin hand saw with teeth that cut on the pull rather than the push. this allows the blade to be extremely thin so it goes through wood fast. it looks like this
in the front corners between my sub and the side wall there is about 1.5' where the bass trap sits.
i used 2" oc703 and cut it into 2' x 4' rectangles which i packed into the corners. i then treated the entire back wall behind the screen with 1" 703 and the ceiling with 6" of cotton. i framed around the side speakers which sit in front of the bass trap. the frames are removable so that i can get access to backstage. the whole setup in the corner looks like this.
btw, notice the hushbox in the second picture up on the ceiling covering the motor for my diy masking system.
for the side walls i decided that life was too short to rip wood into 1" strips so i made the furring 1.5" using 2 trim quality 1x4's. first i put the ceiling strips on and air nailed them to the studs with the verticals cut between them.
then i overlapped these with a second set where the verticals went all the way to the floor and ceiling and the horizontals are cut to fit in between. this way the corners were overlapping. glue inbetween makes sure these are strong with no screws needed.
same overlapping idea around the wallboxes.
tho whole thing looks like this on the sides
note that the columns are not mounted yet. they will cover the gom staples.