Reporting back after about 2.5k km. Besides the storage door, and seat-post slippage, the frame has been perfect.
I got some new storage door (v3?) at Eurobike from LC and installed it yesterday. You will need a metal drill to get the old rivets out, than blind rivet pliers to install it, first one for me to use that kind of tooling! (made a video recording, will put it out as short/insta soon), BUT totally worth it, the new version is so so much better. It "clicks" audible into place, does not fight gravity and is more snug than the old one.
I also got a new version of the seat-post with the grippy area, but hadn't had time to install it, it's also holds in place now with carbon paste + a little more torque.
Also looking forward to the titanium head-unit mount I ordered couple days ago.