12" kick bin speaker plans

Hey i'm in search for 12" kick bin speaker plans.

I saw the cubo12's but i'm looking for a design with a width of 60cm.
Otherwise they cant fit between between my wbins and tops.

i already have some Fane 12500lf drivers so if they could fit between my stack as kicks that would be perfect  

is it posible to rework the plans of an mt122 to be a single 12inch horn?

         

the bottom horn but then with thye 12" drivers

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I would think so, but aren't those 'horns" rather short, and not have much perimeter to support being a true "woofer" type enclosure??
 
 I have a number of 12's myself, and I'm looking for a good design to use 12" enclosure(s) in singles or groups to yield the performance required...

     heck, I/we should just take a minute to design a 12" tapped horn to run from 40-120Hz or so....