Help: Nexus port/diopter combo for 17-55?

I'd like to keep my Nexus D100 housing "useful" (while I move my main rig to a D200) so I'm thinking about trying my Nikon 17-55mm lens in the housing.

After reading all the postings on this combo (this lens in a Nexus housing) I'm confused. Does anyone have first hand experience in the best set up for this lens in a Nexus housing? (it seems the Nexus USA site might not have the config. right...)

Please advise if you have expience...

I have someone in the field shooting the rig right now with the new 160mm glass dome, 70mm of extension, and a gear that custom built for them... I haven't seen the results yet.

I recently did some pool tests (actually in a big tub) with my Nexus D70 & the 17-55 lens. The best results were with a +4 diopter, the special 12-24 dome port & 60mm extension ring. Sharp edges. Next week I will finally get to shoot some real pictures with it, hoping the ocean is the same as my tub.