Here you see the original drawing and the new bent panel flare of the WO. This worked for me, but if you are building anything other than the original WO you are very much on your own. Its new grounds and the results are only due to your own skill, understanding (of how it works) and luck.
I do however think that the curved panels works very good in a couple of different ways.
1, the are extremly stiff and resistent to resonanses and flexing.
2, they should make the "rubber mouth" effect work more effective and give a bit higher efficiency.
3, if you extend the mouth (almost) all the way out to the edges of the box, you should get even higher efficiency due to the larger radiating surface.

Four layers. But thats a minimum for a small size WO. Make it at least six layers bonded with glue for a normal sized WO.

Good call on the triangle thingie whatamacallit at the bottom of the throat. It will increase volocity and lessen turbulance. If Circlomanen is correct this is the final step to what he has already done.
when you mean angle the 12"s do you mean mounting them so they tip forward or back towards the sealed enclosure offsetting the volume of the sealed chamber? I have modeled this as well.

I don't know, it looks like by the pictures Circlomanen has a bigger horn
Area ratio to driver.

well basically it is just the 36 x 36 version laid out correctly.  Then I put curve horn flares. Finally I angle the top of the cab so that the height at the baffle is big enough for the 12 to go straight up in.  it angles down far enough so that the throat has the same area as the 10 inch version, therby increasing the impedance the 12s recieve.  The throat then expands even quicker than the 10 or 12 inch version because the top is angled.

another way to make it look cooler would be to make the horn's top parrallel, the sealed and compression chamber woudl be elevated and angled above the flat horn path.

I am grounded for another week, so I may just build the thing. or at least model it in cad3D...either way I think it is the best way so far to modify the WO for 12s and keep the majority of ti liek the ten version.

any thoughts people?