Not that I'm aware of but it's basically just two Cubo Kick's with the mouths together. So all you have to do is make two Cubo Kick's, one without the bottom panel and instead of using 4 normal side panels, cut 2 large side panels. I would also decrease the height of the ports (now 7 cm) to 6.9 cm.
and about the equalizing graph, i guess ill need to measure the output myself, for it won't exactly behave the same as two kicks put side by side imho? I feel as im the first ever trying to build that plan, quite thrilling
The frequency response mostly depends on the driver used, the cabinet placement (especially indoors) and the amount of cabinets stacked. A double kick will have a smoother response than a single kick. A benefit of the double kick over side-by-side placement is partial force cancellation (that's always good), differences in frequency response will be small and generally of little concern.