This will give you a better idea of how that works. The finished cabinets aren't that heavy and even I can easily lift one and pop it onto the sub cabinet. From there, it's easy to add the side fastener that tie the two together. On the rear of the speaker are multiple sets of binding posts where the top and bottom cabinet's audio signal are connected via supplied jumpers. I'll send you pictures of what this looks like when I get a chance.
Below are even more pictures. You can see a closeup of the new custom ribbon coax midrange Chris designed, the custom leveling hardware on the base, and what the new woofer looks like peeking through the side panel.
Tomorrow it's all hands on deck at the show set up day.