@anomolies this is
@werm11 's light using a similar config. I am guessing on the measurements, but hopefully this guides you in the right direction.
do you not have a metal supply shop for the angled alum? its literally half price or less versus HD & Lowes. and the 36" pre cut pieces are at even more of a premium. But, it may be worth it for you to have it ready at the proper lengths for a few extra dollars..
by the looks of Werm's build. 8 x 36" pieces will cover your build with no cutting, only drilling holes. 1/8" drill bit is just a hair smaller than 6-32 bolts, its a nice combo,
or if you have time to swing by Harbor F :
http://www.harborfreight.com/hand-tools/hand-riveters/hand-riveter-set-38353.html
the "stanley tools" version is also good for a few bucks more. both have rivet packs utilizing 1/8" hole diameters.
View attachment 3664793
also, this is the driver that comes with the 8 COB unit. I really like that 8 cob option going down to one driver and passing along a decent savings$$ Mark. nice work sourcing that driver, and it does support PWM?
http://luxdator.com/_data/s_3836/files/file/PF-P400CC Led driver Luxdator.pdf