Well..I´m also weight weenie and building under 6kg road bike at this moment.
This is what I got from my friend, he makes these by himself, at kitchen!
Yes, he will..dont know price?
I have used older prototype saddle ower year now and still goes strong.
It has been in cyclocross, hardtail MTB and road bike now.
He made this to one woman you might know...Jeannie Longo