steve, anyone with a broadband ISP can just reset their router to get a new IP, so unfortunately bans wont work these days :/
anyway, Id speculate, even if you found a plan for such a chair (or one described as such) the specific dimensions may not be equivalent. when I search google for the chair, I get lots of pictures and I cant say any are a good match for the proportions of the one you posted.
If you sat in one, is there anyway you can go sit in it again? bring some paper and maybe scribe some dimensions and shapes? measure the height of the arms, scribe the pattern of the sides and back rails.