While it may be a great driver for a tapped horn, that is not an 8. As it is a 12, it won't fit inside an 11" wide box, either. Not gonna work.
Funny thing about speaker cabinets - one size does not fit all. As the complexity of the cabinet increases, the chances that things go wrong with a mis-matched driver installed get higher, and the more complex the cabinet, the worse it gets when it all goes wrong. As far as cabinet complexity goes, tapped horns are among the most complex cabinet I have worked with yet, and I'll be blunt - I am still on the steep part of the learning curve. I'm not trying to tell you that they are magic - they are not, the laws of physics still apply here.
I guess - if that's the driver you want to use, I'd refer you to the tapped horn tutorial
I started a while back. There is a lot of great information in that thread, and it will serve to get you started. I do not own/have not measured that particular driver, and I don't think I have any simulations with it. If I did, any work would be with manufacturer-supplied parameters, which may or may not be reality.
As someone (think it was zilch) put it - you can build it however you want and use any driver you want, just don't call it my design when you are done.