Great frame choice, I really love mine and the ride is amazing. The frame is under 2 kg even my size 57 is 1800 gram ish, the cut fork on my ride weights in at 360,8 gram, the headset bearings are 28,1 grams and the spacers I've used combined to 22,8 grams.
Do yourself a favor and get the Parlee 28.6 clamp for braze on derailleurs. They weight a few grams and are friendlier to your frame then any allow adapter ever will be. This steel is thin, if you over torque the bolt of a alloy braze on adapter it will deform your frame. The Parlee clamp wraps around the seat tube and provides almost complete circular clamping on the frame. You can still find these clamps on the Bay.
Yes they are expensive, but they should be one of those parts that you don't have to think about. you know you need it.
From your spec sheet I see that you are planning on a 53 39 crank paired with a 11 28 cassette. Have you ever thought of using a compact crank with a slightly bigger inner chainring? This way you can ride a 11 25 cassette and enjoy the closer gaps between gears. For instance, the area I live in is completely flat. I need to get into the car and drive in order to get to some decent hills. On my Ritchey you will find a compact crank with a 50 39 combined with a 11 23 cassette. When my rides are in medium hills I simply mount a 11 25 cassette when the climbs get longer and I can no longer power over them I mount the 34 on the crank.
Bartape, have a look at what Lizzard skins have on offer. their 3.2mm tape is pretty awesome. and comes at a decent weight. at least not 150 grams.
Get some Ti axles for the speedplays. they don't have them listed on the website, but if you email and ask for them i believe they can help you at titaniumspindles.com
. mine are running for years now.
The bottle cages you list are CF, but not that light. Tune make a decent cage that is light as well.
I hope I gave you some good info. have fun with the build.
'Tape was made to wrap your GF's gifts, NOT hold a freakin tire on.'