Here it is, The bottom part of the main horn was actually gonna be a bunch of laminated 3/4 plywood pieces that would also form the upper mouth of the bottom rear wave horn. The sides of the upper horn would also be constructed this way as to eliminate hollow area's that might resonate. Also there was gonna be a laminated half arc piece behind and above the speaker to eliminate some of the square corners inside the cabinet. The entire path the rear wave was to follow would be very fluent.
BTW this is not the standard A7 cabinet size, I think it's smaller. Also the bottom horn is not calculated at all. It' was just a thought and a drawing.
SpeakerCabinetSmall | Flickr - Photo Sharing!
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