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save yourself the money, time and faff for nearly no gain
Agree, but where is the fun in that ;)
After a bit more reading I found this post interesting, particularly frame tolerances/compatibility and weight savings.
Makes me think a used bike (if I can find one) and replacing parts over time may be a more sensible approach. Will likely prevent a realistic 8kg build
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if you go the carbon route you won't be able to fold it
Why can't you fold a Brompton with a carbon seatpost? Agree with most of the other points though, but I guess it's the carrying weight on/off trains and up stairs which is the concern.
@pjhobs have you posted in the Brompton thread for tips or maybe @R.hobbs has a view? My 2p would be looking at the 2 speed to 3 speed hack and using a ti seatpost. The one I bought my dad has been fine and saved a noticeable amount of weight.
Another tip from someone on the Brompton is when using lightweight tyres was to buy inner tubes with removable valves, then put sealant inside the tubes.
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The seatpost is going to weigh a lot, and if you go the carbon route you won't be able to fold it which takes away the entire point of the brompton.
I would say get a normal brompton and then get some nice aftermarket eazy wheels (or whatever they are called) that make it lovely to drag around. They are also cheap and replaceable. Get a few other swish accessories as she'd would like and save your self the money, time and faff for nearly no gain. She'll end up falling in love with it regardless because they are so insanely fucking practical that she'll forget about the weight after a week (max). Also only get three speed as 1 speed is too hardcore and 6 speed is heavier and uneccessary.