Thanks for your comments guys!
Actually, I agree with the last comment - I have this struggle myself, whether to go with unusual design like this or with a classic one where nixie display itself would be the unusual part. I am working on this for some time (2 years :) ) and I must say that it is very tricky to achieve something good in both direction. One of the problem is that watch designers are a bit confused how to approach such an unusual display. It is hard to find a balance, and I still don't have an optimal solution.
In last couple of months I am working with one Swiss watch design company I am hopping to get better output and ideas.
I'll post soon as I get the updates myself.