I've been contemplating this for awhile and recently a potential customer has asked for something along these lines.
A pair of the Dayton 180Esoteric drivers and the rs28f tweets in a seos 8 waveguide. TMM layout. Using the Dayton specs, it looks like I can get into the mid to upper 30s in about 1.3 cubes. The waveguide will allow a crossover point in the 1 to 1.2k range and I think a sensitivity in the upper 80s. The enclosure dimensions are probably going to be a little weird as these will probably wider than they are deep.
The customer is a friend of a friend who heard my Victor build and really likes them but the size is more than his room could handle. But the appearance he loved (woodgrain vinyl baffle, black duratex sides) and sense he is footing the bill, he gets what he wants
Hopefully, this will commence soon!