Yep, I believe it is possible.
Frame: Lightish alu 1300grams (cannondale/principia/trek etc.)
Fork: full carbon 400grams
Wheels: in 1300-1500 grams range (alloy or used carbon, depends on brake setup) Look for a bargain.
Tires: 200 grams models with decent protection layer (GP4000s/ etc) I like Duranos for commuting with light tubes
Crank: nice and light and used for fraction of the pricew (dura ace 7700 if you can get hold of it cheap)
Components: lightweight alloy stem/bars/seatpost rideable saddle like Flite or whatever suits You
Brakes: standard road? or V's? Get high end ones (xtr/ da/ kcnc or Avid SD Ti)
I love this:http://weightweenies.starbike.com/articles.php?ID=63