I ran into some problems with the second half of this build.
TRP brakes. I’m used to Shimano, where the hose is not attached at the shifter to make for easy installation on an internally routed frame. I ended up having to cut and bleed both anyway, but it made the routing more complicated than it needed to be, aside from the rear chainstay where Trek has made it as simple as possible where the frame forms a tube for the hose to run through.
I had to warranty my rear brake after installing it and trying to bleed it when we found out the bolt was over tightened, meaning I could not loosen it to bleed the brake. TRP was very good about it though and promptly shipped a new caliper, and I am able to cannibalize the first one for spare parts. Then I had to cut the hose again, but it was not as much of a problem this time and the bleed got done.
Not necessarily a real problem, but I hate wrapping bar tape.
Overall, this build finished up well, although I do not like bleeding TRP brakes. The brake levers actually have holes in them, so they look pretty cool in photos, and the bike is fun to ride with perfect gearing. Learning the dropout system and setting up a singlespeed is a little new to me, but with the help of more experienced mechanics I got it all done.