Yes, this is very cool indeed, ... hell the entire idea, all of it. And the box design and wood-working, very nice work thus far gentlemen.
Employing and optimizing this monster, and blending it into your system/room, near-field, should prove to be an interesting study. Yeah, this will be cool, and something I find of particular interest.
I'm curious about your EQ'ing/alignment plans, tools, etc. Aside from the typical small-sealed signal shaping, near-field placement often incurs some unique signal shaping challenges wrt both objective observations, and subjective preferences. I've shared this previously, but 10-to-15 years ago, I experimented a lot with a pair of near-field Velodynes. I found it fascinating balancing the tactile immediacy, with full extension and acoustic gain effects of the room.
It seems as if there's a lot of exploration and discussion of near-field effects as of late, rightfully so.
This is going to be a good one, exciting stuff. Thanks for sharing and best of luck. Just bad-ass.
(I wonder how much reactionary box movement you'll be up against, ... anyone recall statements wrt Beast's enclosure and such motion effects?)