Dob frame + Fork. Try-All H hubs on Dob rims. Whats brakes does he want? Dual disc or disc/hs33? Monty TI cranks, he will be fine with them. TI Bar and stem, possibly a shorter stem? For the freewheel I'd get a Tensile, they are very cheap and work brilliantly, mine is over 1 year and 6 months old. Lightweight chain, as he is small enough not to snap it. Wellago MG-1 Magnesium pedals, they are pretty expensive but they do save a fair bit. (Echos, Onza hognesiums are all Wellago MG-1s). Your best bet is probably to ring up Adam at TartyBikes,as he has a lot of experience saving weight and will be able to tell you which direction to go in.