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@roboto
Hi.
I spaced out the zen chainring with 1.2mm spacers between the ring and crank spider using these. This works too because the stock Omnium ring is quite thick and uses longer road double ring bolts. Placing the spacers under the Zen has resulted in a nice smooth transition between spider and ring. :)
It's given an estimated 43mm chainline at the front, but really I don't think the whole chainline thing is a huge issue. The only time my chain makes a noise is if it gets too dirty. Once it's cleaned and relubed my drivetrain is silent.
I run 44mm chainline goldtec hubs on my track bike and use 111mm Campag Centaur BB with Sugino 75s on there. Again, this makes it basically a 43mm front and 44mm rear. Again, no problems.
I price matched Jenson's stock against Niagara Cycles who don't actually ship to Europe and they were fine with it. http://www.niagaracycle.com/categories/paul-high-flange-rear-120mm-32h-black