Ended up doing quite a few changes:
as stated above, replaced crankset for easier climbing, new pedals (283g saving, much improved crank bearings), elitaone carbon seat and seat post (348g), uni stem (9g saving should have checked that first...) and 2 Schwalbe little joe tires (202g saving each). still waiting for a carbon handle bar. Total weight saved so far, 1,044g, and probably some more with the bar.
It's been fun working with my sons on changing all parts, teaching him about mechanicals and swearing in the confine of the garage!

Wheels have been built:

Ok i better understand. The center lock is purely a marketing and competitive choice: tooling to make center lock is more expensive, wiping some of the cheaper competition.
It’s however a lot easier to drill 6 indexed holes precisely than it is to machine à complicated pattern…
After being away from biking for 20y, I found some of shenanigans from the big companies to be really pathetic and it was part of the drive for me to built my own bike with Chinese components

I got my set for 73$ delivered with 11/11 discounts:
https://chinertown.com/index.php/topic,4446.0.html

Jeff, any lesson learn on headset cable routing? I will receive my frame (spcycle) in a few weeks and I have to route through the headset as well

So they make these too:
https://www.allebike.com/sv/produkter/cyklar/mountainbike/majestic-fs

Ask Leon at Yuan An, he has some good prices on what seems to be like good wheels. A few of us ordered from him over the last couple of months