Finished my build and just went for a short ride to check on everything. Rides very nicely, very stiff (I might change the rear tire from 25mm to 28mm to increase comfort). Overall I'm very happy with it and for the cost I cannot complain (warning: new toy syndrome). The fit is also nice, as I was afraid the frame could be too small. But the aero spacers and saddle setback make up for it. I'm 188cm tall with a 92cm inseam and long arms, got the XL Frame. I haven't decided on the final bike fit, so I still have 15mm 3d printed spacers on top - thanks to the stranger who designed these and put them on thingiverse! I'll also put some TPU on my 3d printer this weekend and see if I can draw up some grommets for the frame openings that I don’t need due to the electronic shifting and a seat post gasket.
The only issue I have not solved yet is some disc brake rubbing on the rear brake that I cannot get rid of at the moment. Possibly due to misaligned (unfaced) brake mounting points. I went with post mount brakes as I got the Sram Red groupset for 600€ cheaper than flat mount, so I had to use adapters that increase the distance between the calliper and the frame. Not sure if that worsens the issue. I might want to exchange the callipers to flat mount. Does anyone know if changing to flat mount callipers helps with the disc brake rubbing? Or does anyone have experience with DIY facing the brake mounts?