The bar diameter is a sticking point I imagine. Perhaps you could fabricate a steel bar in a slimmer diameter to the standard 22.2 - and braze in a shim for the stem?
Titec produced a bar a few years ago called the 'hellcat' with a narrower diameter on the ends "for ladies" with tiny hands. (EDIT - 19mm OD) The bar was still a good width so unsuitable for your purposes but crucially: They also produced some correspondingly smaller grips which you could use if you made a skinner bar.
BMX stem is the way to go - And in terms of saddle / seatpost .. All the bmx guys ride those saddles which bolt straight onto the post now (through the top of the saddle) which gives a nice clean look (although most BMX posts are 25.4mm)
The bar diameter is a sticking point I imagine. Perhaps you could fabricate a steel bar in a slimmer diameter to the standard 22.2 - and braze in a shim for the stem?
Titec produced a bar a few years ago called the 'hellcat' with a narrower diameter on the ends "for ladies" with tiny hands. (EDIT - 19mm OD) The bar was still a good width so unsuitable for your purposes but crucially: They also produced some correspondingly smaller grips which you could use if you made a skinner bar.
bar:
http://www.fudgescyclestore.com/index.php?p=176866
grips:
http://www.bikewagon.com/titec-hellcat-women-s-mtb-grips-kraton-black
Just a thought eh?
BMX stem is the way to go - And in terms of saddle / seatpost .. All the bmx guys ride those saddles which bolt straight onto the post now (through the top of the saddle) which gives a nice clean look (although most BMX posts are 25.4mm)
http://www.chainreactioncycles.com/kink-sexton-pivotal-seat/rp-prod74684
Or go with something like this ... Cheap and equally clean - Lookin'
http://www.chainreactioncycles.com/black-sheep-mini-race-seat-post-combo/rp-prod106276