My point (or, more accurately, question) is that if you CNC’ed the bafffle / sides (and all the parts traditionally cut from MDF) from a material like Corian, would the complexity / cost of finishing become irrelevant? I would imagine all sections would fit together using biscuits & dowels, fixed using color matched epoxy. From the videos I’ve watched, Corian seems to carve quite nicely, and the S7 seems to be a good candidate (as well as the wedgie).
Even if the costs of the flat pack increased by $1,000 to $1,500, compared to a pro paint job, it could be considered reasonable. I think this type of approach could help you break into new markets - people who are intrigued with the sonic potential of DIY, but not the tools, time, or talent to make the product look professional. Literally selling high end speakers just like IKEA furniture.
Just throwing it out there.