Gosh, it’s quite a tight fit in here. I appreciate your help and photos.
From what I can see, I'd speculate that even the 6th cog results in a slightly shifted chain toward the center line at the cassette's side; but I'd gladly hear other opinions. Indeed, I can't understand how this frame is supposed to accommodate 40T even with a 0mm offset.

Let's see what other users can say on this matter. Perhaps mr. Snife might have something to share.

Sorry for not replying earlier. I was too busy mountain biking :-).
First of all, the bikes rides like a charm. It climbs so well and I also did hit jumps / drops of around 40cm, it feels very capable in that regard. The 120mm Sid with 35 stanchions feels like a perfect fit. I hear some minor rattle when I drop/jump, which i guess is the hydraulic brake hose in the chain stay. I used foam for the inner routing, but this was almost impossible to get into the chain stay.

Generally I am very very happy with bike. I need to cut down the carbon post by a few centimetres and get a quick release clamp for riding down nasty stuff.

My first training race is yet to come in April.

Regarding chainline:
I guess the 55mm is because this is a direct copy from a Scott scale (2023 model upwards), the 55mm chainline is used.
I didn't even try to use standard boost. I am 100 percent sure this is due to UDH being used by SRAM Transmission, which all use 55mm chainline (MTB wide standard). All transmission chainset use MTB wide / 55m.

What I did: I use a standard bb92 dub bottom bracket, and bought the spacer set from SRAM. I follow the SRAM dub manual using a 3mm spacer on the left and a 5mm spacer on the right side.
I use a SRAM X0 chainset with integrated power meter with 175mm / 32t.

You can get the gx transmission chainset for around 100 to 150 euro new now. I also like the style of the transmission, especially the x0 with the hole in it.
All transmission chainsets are compatible with standard eagle chain and derailleur. In my case the gx axs.

The chainline doesn't cause any issues, it shifts perfectly, no need to setup or change anything (beside b tension of course).
My rear wheel is standard boost obviously.

I don't have any pictures, but I might post some next week. I don't have the bike with me right now.

I finished mine (mostly) as well.
Some minor things like brake fluid / air in the system. Haven't ridden it yet due to being sick all the time.

Weight is around something around 9.8kg - I don't have proper scale, only one intended for luggage.

What chainline does this crankset have? The frame is 55mm chainline (as is the the Scott scale).
That means (w/o considering noname) it's either MTB boost wide / MTB wide or the new SRAM transmission.
Otherwise your chain might rub ob the chain stays.
I am also considering a build with the m06 and waiting for the Large version.