I'm mostly done with my build now, it went much quicker than I expected. I had to order a replacement front derailleur, for some reason the first one didn't work properly. Even after holding it side-by-side with the new one, I couldn't figure out what was wrong.

Next steps are to adjust & bleed the brakes, have a quick shakedown drive and put on the handlebar tape. After that give it a good cleaning and add some protection on the chainstays, etc..

Quick summary of the setup:

• Frameset: Lightcarbon LCR017-D, superlight, size 54, HBR 13 integrated bar & stem 420x90, seatpost with 0mm offset
• Wheelset: Lightcarbon C52DB Carbon Gravel Wheelset, 33mm deep rims, with upgraded spokes (Sapim CX-Ray)
• Groupset: Shimano 105 R7100, 12-speed mechanical, disk brakes
• Tires: WTB Expanse 32 (there's enough room to fit 35mm tires or even a bit bigger)
• Saddle: Brooks Cambium C13 Carbon
• Pedals: Shimano PD-ES 600

Weight is around 8.2kg in the current setup (incl. pedals), which is more than good enough for my purposes.

I have cut the steerer tube on my bikes few times without ever disconnecting hoses. In your situation it gonna be a bit more complicated since your not going to be able to slide the handle bar off that steerer tube. You will need to cut the steerer twice, first to get it low enough to pull the handlebars off still attached to the hoses, then a second time measured to final length.

Turns out it was fairly easy to get the handlebar off, after all. Cutting the steerer was a breeze as well - I just clamped down the fork on my workbench and free-hand sawed it off with a metal saw (helps to have some practice with sawing in general from all the woodworking I do). A bit of sanding off the burrs and it was good to go back on the bike.
Second time routing the four cable hoses through the handlebar was much easier, too. 

Installing the headset properly was a learning experience, luckily there's so many great videos available.

I'm moving on to install the STI shifter/brakes now and then setting up brakes, FD and RD.

Oh, and I forgot to mention, bottom bracket and crank installation was very easy. The crank spins super smoothly - I went with a BB that Lightcarbon provided (i thought i can't go too wrong for 15USD). Will have to see how it holds up over time of course, but I can easily switch to another BB if required, T47 be thanked.

LCR017-D ? Standard or Lightweight version ? How much did you pay ? Any (closeup) photos ? Including internals, etc ?

There are so many different companies and models, I'm getting confused. Is there a contact person on the forum for the LCR017-D ? How is this compared to TanTan or Xiamen Carbon Speed ? I'm planning to get the wheelset from Carbon Speed, but still holding back as I'm undecided on the frame.

This is the LCR017-D thread, so yeah that one, in the superlight version. I paid 550 USD for the frame set as described on the LC website. Shipping/customs/duties and custom paint job + decals come on top.

I didn't take any photos and will only take a few of the build throughout the process.

Jim Lee was the contact person i dealt with, he was active some time back in this thread. Haven't seen him here for a while now. However, he was always super responsive and helpful throughout the whole process.

I have no way of comparing to other companies, it's the first time for me going this way about buying/building a bike. My first/current bike is a Canyon race bike i bought 20 years ago.

I've already detailed all the issues in this thread with pictures. Im glad that your frame turned out ok and it's probably due to the fact that I was "crusading" my issues with LC acting as their test pilot/ guinea pig

just out of interest i looked through the thread again, as i couldn't remember you posting anything with respect to major issues with the frame itself.
This was the only thing I found:
"The front and rear caliper mounts could've been faced to help with alignment.  The rear cutout for the derailleur hanger was a bit wonky and needed a little persuading to help it align to prevent it from binding up the axle when the set screw was tightened.  I choose black to specifically camouflage the overly boxy down tube.  Other than that the bikes been a dream to ride the first 400 miles thus far."
That, plus that you're unhappy with the paintjob (white base coat / no clear coat).

Can you remind me again which other issues you're talking about?

Not to be rude but why don't you go and kick rocks if you're not interested in my thoughts on LCs  crap manufacturing and Quality control issues.?

because i've read it a couple of times now in this thread. it got old very quickly and is helping absolutely no one with the questions they have.
And i'm commenting on it to try to get you to stop, because the forum software doesn't seem to allow me to block people like you, so i wouldn't have to endure the same drivel on nearly every page ...

I'm 100kg in weight, and 187cm tall, and I'm looking at the 58cm size. I'm planning to do a lot of sprint training on my new bike, and I'm wondering whether I'm risking my collarbone and teeth trying to save 500 dollars.

While I'm still waiting for delivery of my frameset and wheels, I would just caution you selecting this frame based on your weight and intended use. This is a claimed "superlight" frame, and I would be hesitant to go with that frame and rather go with a more beefy frame.
I'm no lightweight myself at around 85kg, but I'm not planning to subject the bike to super heavy loads, rather just general road bike exercise (no races).

But, as mentioned, i've not yet been able to use the frame so maybe others can chime in with more real-world experience.

...
you're quite brake ordering one. FYI, you can buy USB endoscopes for super cheap on alix, in your shoes, i'd 100% get one and make a conscious effort to inspect all tubes of the frame i receive, because composites manufacturing isnt trivial, especially now that we all want light frames again. If your layers aren't compacted properly (should be much less of a problem now that EPS / latex moulding is very widely used), or if you're straight up missing material in key areas, then bad things can happen.
...

not to worry, i have ordered an endoscope already and intend to thoroughly check the frame once i have it in my hands. I will share here if i find any issues.

But i don't think it's brave of me to order one - the risk, at least in my view, is fairly small. And that, for me, is okay, especially given the prices we're discussing.
And if there's any issues, i have all winter to get this sorted with LC ...