Actually, I don't use a computer, just ride and race au natural.
Oh, the horror! Does not compute! Slightly off-topic
To be honest, getting all the "necessary" accessories together takes longer to finally get on the road. Makes me want to just ride "au natural!"
* Get dressed. Get undressed because you forgot the HR strap. Get dressed again.
* Put on headband. Strap on helmet and slide glasses into vents. Bend over to get stuff and have glasses fall out - repeat many times.
* Put on bike shoes. Take off shoes to go back into house to get water bottles. Put shoes back on.
* Get headphones and cell phone situated through helmet straps.
* Pump up both tires because latex rolls so much faster and loses so much air overnight.
* Turn on rear blinky. See if it's bright enough. Replace battery, if necessary.
* Turn on computer and wait for it to boot. Check battery status. Check eTap battery status on Garmin.
* Attempt to leave house, but realize water bottles aren't on the bike.
* Etc. Etc. Etc.On-topic
* Comprehensive build list! Thanks for sharing. Yup, you nailed some of the lightest tubes, tires and QRs already.
* There's weight to be saved in the headset / top (maybe 50g for $$), seatpost clamp (15g for $), saddle (upto 50g but $$-$$$), stem (50g for $$), bar (70g for $$-$$$), cages (15g for $-$$), hard to know on cables but probably another solid option and Veloplugs over tape (20g for $). Call it ~270g or .6lbs and me thinks you're just getting started!