Glad to see so much going on with these. I've got a real itch to hear what these can do after reading so much about CBTs and the PE/Audio Artistry pair. Can't wait for kits (yours or PEs) to become available... I feel my wallet getting lighter already.
Really like your stacked box approach to the array, seems that would make home building easier than bending a front panel, provided you can cut the bevels right on the boxes.