That driver looks like it has a massive magnet! Great for preformance, but it will be a real challange fitting it into the WO
You know that you will have to tilt the baffle to fit the 12" in the box, but as you tilt it the outter rim of the magnet will hit into the side of the box.

Good Luck

your both correct it was much 'fun' getting the drivers in, but then again the real fun only starts once thats done .
Regarding the 10" throat, we got access to smaart live for some measurement, seemingly whilst crossing over on 24db butterworths at 30 and 86 hz the box was playing 125 hz very loud, admittedly this was indoors in a small room.
ive since removed the plasticine in the troat and will be taking more measurements tomorrrow,
im not ruling ot the 10" throat could work, just needs to be a more gradual transition i reackon....

someone mentoned lab horns earlier, given the choice of 4 wicked ones with decent drivers or 4 lab horns , i know what i'd be using