Here is the planned build list:
2018 Trek Boone 54cm frame set
Trek seat post topper (white)
Bontrager Pro 7 degree stem (white, 110mm)
3T Superergo Team road bar (420mm)
Sram Rival Hydro 1X shifters and calipers
Sram Rival 1X rear derailleur (long cage)
Sram/Quarq 172.5mm carbon crank arms
42t Garbaruk direct mount chainring
Bontrager Montrose Pro 148mm saddle (will try it for 30 days to see how my butt likes it)
Challenge Gravel Grinder Pro Tires 700x36c (gum walls)
Sram or Shimano chain - Ultegra or 1070 or whatever I can find at a better price

Cassette - most likely 11-32t
Still pretty undecided on the wheels but narrowed down to following two choices that I can get a good price on:
1. Bontrager Aeolus Pro 3 TLR Disc - https://www.trekbikes.com/us/en_US/equi ... black_grey
OR
2. Bontrager Paradigm Elite TLR Disc - https://www.trekbikes.com/us/en_US/equi ... black_grey
With the option 2 I'm saving about 80 grams overall, getting hubs with DT Swiss internals and saving about $150 bucks. Not sure how much aero would matter with a fatter tire. Option 2 seems more sensible but open to suggestions.
Also, unsure on rotor choice yet. I think I might do 160mm in front and 140mm in rear. Should I keep everything Sram or are Shimano rotors better?
I'll be updating this as parts trickle in. More to come...