Sorry for the late reply - yeah quite a few spacers. I am honestly considering switching to a different power meter because although everything works right now I am still worried about long-term compatibility in the back of my mind.
It took a bit of back and forth to find the balance between spacers/chain line but it is workable for now.

Hey all, just wanted to share some pics of my recent TT build. I decided to go for mechanical shifting even thought the frame was very clearly designed to NOT accommodate anything other than electric so it was a bit of a process to get everything working but I'm happy with the way it turned out.

Originally I had mechanical shifting and brakes - we determined that only a single mechanical brake lever could be used due to the angle of the internal cable routing. It was barely possible to route three cables, and likely impossible to get decent braking without changing the entire headset.
In order to make this race legal (and safe, I guess) I had to buy hydraulic brake levers - the most expensive part of this build besides the frame.

Components:
VB-TT-23 frame
TRP HD T-910 Hydraulic Brake Levers
Microshift Aero Bar-end Shifter (1x)
Lingmai T47 BB
KMC X11 chain
Shimano 105 RD (Medium Cage)
Magene PES 505 Crank Power Meter (170mm)
Stone Round Aero Chainring (50-tooth)
Microshift cassette (11-speed: can’t remember if it’s G-series or H-series)
fi’zi:k Tempo Argo R5
Zipp 303s
Vittoria Corsa Pro Speed (28mm)



I don’t have pricing at the moment but I’ll update the post when I have time later. Before adding the brakes, the entire build came in well under my $2k budget due to having most of the drivetrain and wheels already.

Considerations for the future:
Rear disc wheel
Electronic shifting
Saddle-mount bottle cage
TT-specific saddle

I think I will only upgrade if I continue to place well in races. I want to avoid doubling the cost of the bike if I am still finishing mid-pack.


Happy to answer any questions about the build.