The Wicked One bandpass can be modified as a 6th order bandpass box?

Hell yeah man, build a standard one, throw in the specs in winISD or other program, figure out a good tune for the sealed chamber and do it.  If all else fails, you can replace two walls with the big port holes in em.

It definately is possible though.  And If I remember correctly, the best way to model the WO is as a 4th order tuned to 45hz.

what  A and J  said.