Ah, if you can't get aliX to step in then negotiate the most reasonable outcome. The spokes & rims are fine, presumably, there's just the rear hub that's shitty (i think it's really really hard to mess up a front hub). You may have to get ready to learn how to rebuild a rear wheel. If you've never tried meditation, that may be the time to start

The wheelbuild itself are not a problem at the moment. And the fronthub is not a problem at the moment either.
Its both of the rear hubs that are messed up. But lesson learned and both the wheelbuilding skills and meditation are next inline to survive this bikebuild

I've been looking for a similar thing and coming up pretty empty except for the Specialized SWAT box for my epic.    I guess it would fit my Gravel bike too.

I've considered getting a couple sheets of Kydex to try and form my own little box around a wood cutout that would utilize the lower bottle cage mounts and some velcro adhesive for placement.    I *could* use carbon fiber, but kydex is easier to work with (just add heat and form) and thin kydex often ends up a little more flexible so I could pop rivet a latch onto it to create a lid at the expense of having semi open seams riveted closed.

Build done, except for missing bar tape. Er9, Magene p505, edge 45mm. Size 58 comes at 8.05 kg as you see it on the picture. Test ride is next.

Hello can I ask you what are your height in order to order a frame?

That seatpost area is innovation nobody needs, quite the opposite. Also, maxing out at 30C in 2024 is really not future proof.
I wish you'd make a light Trek Emonda with 32-34C clearance, or a Look 765. These look nice, have wide clearance, are light, and have geometries where a lot of people could slam that stem AND be comfortable.

Is there any suitable direct mount derailleur hanger to use with this frame?