Jur
Congratulations on your new Birdy and a very thorough review. I am jealous of your monocoque frame. It looks great!

Here are a couple of thoughts from my Birdy experience.

Water Bottle

What works really well for me is a Cat Eye plastic bottle cage zip tied to the stem riser. http://www.mec.ca/Products/product_d...=1223437007264

I had first tried mounting the bottle on top of the top tube but did not like the way the water sloshed backwards and forwards when the bottle was half empty.

Tires

When I replaced the old style Birdy tires with Schwalbe Marathon Racers it made a huge improvement in the way the bike felt (faster smoother and higher quality). Your tires are probably better than the old Birdy tires but I think that you would still find Marathon Racers or Stelvios a very worthwhile upgrade.

David