Finished the build, had my first ride today!
Great ride feel. Very soft feel, especially with those 35C tires. But the frame, maybe the special seat-post takes meaningful amount of road vibration and bumps. On the other hand, it feels also stiff when putting in a little power.
Even though I reused my 105 DI2 it has the New Bike Feel. Very agile with that short handlebar (80mm). Handlebar is a little to narrow in the end, If I could, I would probably go wider (38cm -> 40cm), as my previous HB had all flare, but this has none. Anyways, that's more Aero, right?!

For building up, my key learnings:
- Make sure that you have the right BB and the right tool for the BB, as I already wrote before I made mistake here. Also there seems to be a couple of different diameters, numbers of notches etc. for T47 BB tools.
Fork cutting - I would say this is the most risky situation, as you need to cut with an angle AND - according to the one page manual from LC - "make sure there is a gap of 4-5mm between the top of the stem and the expander plug". Even the usual tools on Alix are only useful for cutting 90º - I build a contraption with miter box + angle to get it into the right direction but used a jigsay in the end anyways. The cut is not particular bad, but not beautiful either - If more experienced builders can share their process here, that will probably be helpful You probably have to cut 90º - I didn't read the "manual" very carefully. Check next post.- Besides cabling the nasty brake hoses through handlebar + frame there were no other major obstacles.
- No sounds from the frame, even putting in 1kW, no squeaks etc. - BUT only the rattling of the rear brake hose in the frame when moving vertically with the bike - As some of you mentioned: having a liner may help here. I tried tape, but ofc the hose will move inside the frame when you turn the handlebar and the tape will cut loose
