I’ve not bought from them but they are very competitive.
https://www.actionsports.de/en/wheels/custom-wheels/mtb-disc-29-/?p=1
I’d go handbuilt, mainstream hubs (ie DT, American Classic.
Carbon rims allow the use of lighter spokes ie DT revolutions and still remain stiffer than Crests. Crests are (I am told) too flexy and need the next step up ie Sapim D light spokes. At that weight you could reduce spoke count on carbon rims but 4 spokes per wheel it’s hardly worth it and resale is likely poorer
Alloy nipples
Light weight discs, tubeless and keep an eye on tyre weight without doing stupidly puncture prone.
To give an idea DT240, D light, alloy nipples, 32h Crests are approx. 1500-1525g, the same with carbon rims about 100-150g lighter.
Shit happens to wheels – sticks, rocks etc. Personally I don’t think the carbon is worth it.
Tubeless is a must. Godfather lesson required!