There's a LFGSS build thread with a lot of pisstaking but also some nuggets of info:http://www.lfgss.com/thread86203.html
That build used a Dolan Seta which aren't being made anymore.
Personally as others have suggested I would get a cheap carbon or light alu frame. With the use of a half link and possibly a tiny bit of careful and thoughtful filing you should be able to convert most road frames. The one thing to make sure is that you've got the wheel properly secured and if you do use a QR make sure it's a shimano cam type.
As for rear hubs, I'm not sure of the weight, but the surly fixxer will allow you to convert most road rear hubs so you might save some weight with a ww hub, but equally you might not. Planet X/On-one have some very cheap hubs, so your £/$s might be better spent on light rims.
If youre up for something different on the LFGSS thread there was talk of converting a Tune Cannonball with a custom axel and using a bolt on cog. That's obviously a fairly time consuming route thought but would be pretty sick.
Also a few people have mentioned cranks like the Miche and Sugino Messengers I wouldn't go for either. Miche generally don't have a great reputation for quality and the Messengers are just old road cranks that some how got flogged with OTP's and marketed as track cranks. I think converting a decent road crank with a 130bcd ring is a much better way to go. 130bcd rings are pretty common and you're more likely to get a lighter crank.