For a mate doing national hill climb we once built a bike at work but for some reason he wanted to ride it 30miles each way to work too to get used to it. We just used an alloy track frame that was slightly too small for him, long stem and carbon post, bonty x lite road front wheel second hand and a kindling based rear wheel, stripped an slr saddle off eBay ( big weight and cash saving), carbon drops and hacked down record no shifter levers I think, plus he had some to spindles fitted to his speedplay pedals.
I love ghetto weightweenie.