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@Rod_Munch
Yup 44 x 16 is what I use, but then I'm no trackie...
Bikebuilder, the Sugino, or any JIS square taper BB, would be functionally ok for your requirements and 103 is the mathematically correct length for your chosen chainline if using an Eno.
I still have big concerns about clearance though I'm afraid. Googling around I can't seem to find anyone running a BB that narrow - in fact, the only reference I could find was from someone on another forum saying it wouldn't work...
http://groups.google.com/group/rbw-owners-bunch/browse_thread/thread/8ab5a17a67afc798
White have instructions on their site regarding chainring and crank clearance...
http://www.whiteind.com/techcorner/crankinstructions.html
http://www.whiteind.com/images/ENO_CHAIN_RING_CLEARANCE_GUIDE.pdf
I'd be worried that they repeatedly mention that you may need to use a BB bigger than 113 to achieve clearance (and don't even cover the possibility of using one narrower than this).
The LFGSS transmission DB also has a few details of Eno user setups and it seems 110 is the smallest being used.
http://www.londonfgss.com/thread3372-6.html#post1091211
My personal opinion is that even a 107 might be pushing it...
If you have direct communications open with White, could you ask them for their opinion on achieving lockring, chainring and crank clearance with a BB that narrow? I would assume you aren't the first person to try and achieve a 42mm chainline with their cranks?! :)