Cool! Note that spokes and hub are “matched” set. The “wide” spokes are too big for another DT Swiss hub (the CR1400 don’t look to be the WIDE spokes though, measure the round part before you make big plans - 2.6mm is non-std, 1.8 though 2.3mm are standard). The hubs use “T-head” spokes,which are not straight or j-bend. The t-head spokes are straight pull spokes that you flatten the head (bend two sides up) with a hammer or vise. If you want to reuse those spokes/hubs, you’d want to find a 24hole rim with a ~594 mm ERD carbon rim ~24mm deep or so (or 575mm and go internal nipples ~40mm deep carbon rim).
Economically, this is a great way to go if you plan ahead, because you’re looking at (minimum) $250 for a set of DT350 hubs and $150 in spokes for that grade of spoke. With those wheels, you’re at $575 and you can upgrade to top end for $400 while selling the existing rims for $100 and the other stuff for ~$60. I tried this with cheap set of g1800 and got screwed by the WIDE spokes. (I had good luck with lightbicycle, carbonfan, and EIE carbon rims BTW. They all seem to be over built. )
Rim joint
When they put a rim together, they either “pin” (rivet / sleeve) or weld the seam. The welded seam generally holds air fine. The pinned joint is not air tight, so you’ll deposit a lot of tubeless goo into that seam until it seals.