Finished my build and did the first two rides. Thanks to all contributors on this thread! Super happy with the result. Came in at 12.9 kg, even though my list said 13.2. Maybe I forgot something? 
Frame is 19", 2487 g with hanger and the supplied damper bolts (without axle and saddle clamp). No issues at all with the frame and hardware, fit and finish is good. Bearings seem very good, all MAX type with plenty of grease inside.

Didn't like the fact that the trunnion bolts clamp the damper firmly to the frame, so with bolts tightened, no movement is possible. As a workaround I inserted a couple washers into the blind holes in the trunnion, so that the bolts are tightened against the bottom of the hole and not against the frame. This way, the damper can pivot freely. Still not a "good" solution, but better than nothing. I am constantly checking the bolts...

Rides great, sort of pushes me to go faster on uphills, even though the powermeter data doesn't show a noticeable difference compared to my previous 27.5" all mountain...
Need to dial in the damper (Fox DPS), so I borrowed a ShockWiz  .
Actually I planned to use a damper remote, but noticed that I can reach the damper lever quite easily. So I guess I won't bother 

I noticed that Lightcarbon measures the stack to the axles, not to the BB. So you need to add the BB drop to compare to others...

Not sure if I have shown my new LCFS958. Sold the old one, size L and built a new in size XL. (im 183 cm) The goal was to get even more reach. I loved my old bike and the new one is also great.