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@Skant
As @Eamesy alluded to it's a little problematic to squeeze a chainstay between a fat tyre and a track crackset and I also didn't want to use a yoke.
My mindset is usually to stick to standards and ensure some cross compatibility between bikes and components: if this crank breaks then I can nab the one from my track bike etc etc but this bike is being built to meet my specific needs and once finished will be left as is and ridden rather than fettled with. So on this one I'm making a departure from track standards as leaving the 42mm chainline behind makes life a lot easier.
I plugged a lot of different chainstay/component/OLD permutations into CAD and for me the best option is Life cross bend stays, a 47mm chainline, 130mm hub and 130bcd chainset allowing me to run up to a 46t chainring. This also gives interesting options for cranks.
The Surly ultra new hub meets the above specs but only come single sided fixed, however the Halo Fix G seems like a great option...double sided fixed with adjustable chainlines. Goldtec were previously running on 46mm chainline which would work but I haven't been able to find one.
Mapping out tyre/guards/clearance issues
I had to manipulate the chainstays a little then press a couple of dimples for tyre clearance and we're good!
