Hi,

I been doing some research and this all the ones I found that seem to have full internal cable routing.

Carbonda CFR515-D
http://www.carbonda.com/road-frames/106.html
DengFu R12
http://www.dengfubikes.com/ROAD_FRAME/248.html
Long Teng LTK268-D
http://www.ltbikes.com/product/93.html
WCB-R-268
https://www.workswellbikes.com/race/road-aero-carbon-bike-frame.html
R9 and R12
https://www.yoeleobike.com/road/frames.html
Ican A9
https://icancycling.com/collections/road-bike-frame/products/disc-road-frame-a9?variant=31958611132494#
VeloBuild VB-R-099
http://www.velobuildmall.com/2020-vb-r-099-aero-carbon-fiber-road-frame-disc-version-hidden-cables-p0123.html
TT-X23
http://www.tantancycling.com/index.php?_m=mod_product&_a=view&p_id=879
Pro Mance R8025
http://www.pro-mance.com/product-390-505-114187.html
Edge ARGOS EV
https://www.edge-design.com.tw/Spec-ARGOS%20EV%20DISC.html
YishunBike R015-D
https://www.yishunbike.com/r015-d-new-aero-carbon-road-disc-brake-frame_p41.html

I did not see any similar frames from Miracle, HongFu or Flyxxi

From the list what vendor is good?
This is for a second bike slow build project, I think fitting might be more dificult due to some of the handlebar one piece design not sure if there are two piece design with internal cable.

any tips, advice,im located in the USA, Thanks.