Chris Zavatson plenum kit for L-360 utilised to make my plenum for 320, this required cutting 1/2" from each side and reattaching the preformed edges back in place. Pict 3 shows one edge cleoced in place. Pictures #1 & 2 show 2 bid being applied to the top of the plenum. Later 3 bid will be applied to the bottom of the plenum.
