I don't know about it working perfectly without that stabilizing screw.  The screw keeps the derailleur aligned for more consistent shifting for longer without it rubbing

I finished the Build today after receiving the wheel set.
I've also ridden the first few kilometers to set every adjustment and get a first feel for the bike. The build with pedals and bottle mounts is about 7,5kg.

The mechanical shifting works fine. It only needs some fine tuning. The bike feels very good and stiff. I have to say that I do not really have a comparison. Only my aluminum gravelbike (Trek Checkpoint). I'll also post my impressions after a few longer rides.

I think the frame fits me pretty well with size 54. I'm 175cm with inseem of 82. But after only 10km I don't know exactly.

My personal Pros and Cons so far:
+ Good frame  and parts quality. No bigger problems yet.
+ The build was good with some smaller problems.

- front derailleur hanger not so good for mechanical Shimano due to the missing support for the stabilizer screw.
- paint quality is okay (small imperfections here and there) but the clear coat is very thin so that I already have some smaller scratches. I think the paintjob should be clear coated at least 2 times.

As already mentioned by other people the carbon in some areas (downtube, toptube) Is very thin. You can easily flex it with your thumb. I don't know if that is normal for that kind of frames. I just want to say it.

All in all I'm very happy how it turned out and looking forward to the next rides. The whole build was about 2500 Euro. For that price I can't buy a branded Frame with carbon wheels and group set.

. Looks great!   Sad to say they definitely don't clear coat but rather buff the color to a gloss finish instead.  Only if you order a chameleon color it seems that it's clear coated due to the process of painting Chameleon colors

looks cool.
U still think position is ok? or do you feel stretched?

How much did u pay for the shipping of frame + wheels?

Maybe it has to do with the batches in which the frames were made. Maybe the first set of batches didn't have it and the most recent ones have it. It's the only logic I can find (supposing it's not frame size)