sorry - didn't see your post at first. the panels are each 9 ft tall. they are 2.5 in frames with 2 in fiberboard inside, wrapped with black fabric. on the back of each is another slab 2 in fiberboard that you can't see. the slats are 1/4 in ply arranged in a 3/4/5 ratio slat/space pattern, with different starting-widths on each panel (ratio of 3/4/5 always the same though). all of these panels hang from the trusses and are about 2 in off of the wall (they don't touch the wall).
the perceived room height that you can see in that booth slopes from 10 ft - 12 ft. Ceiling is made of 2 in fiberboard covered with same fabric. Above that we stuffed insulation...The idea for this room was a not-so-dead drum booth. We put a couple of kits in there, listened and added more treatment as we went. Sounds great in there, although we haven't recorded anything yet, so the jury's still out!
Thoughout the building we left the trusses exposed on the 'inside' rooms (in room-within-a-room parlance). We then used the trusses to mount treatment. You can barely see it in a couple of the live room shots.
We spent quite a bit of time in the control room...(now I'm on a roll if anyone cares)...one cool feature is the big sliding panels on the rear wall. I wanted some storage, and we came up with a way to carve off the storage from the control room with those hanging sliders. then entry into the control room is actually back there too - you walk thru the closed to get into the control room. you can then push the sliders into position, and you've got a really nice consistent surface behind you during mixing. we spent a couple weeks fiddling with the control room and it now charts really well when measured, but we're gonna wait until the console arrives before doing any further tweaking.
this whole thing has been a blast but really anxious to actually use it...
long winded answer to a question about the panels...jon