The narrower the better.   I'm running 380mm bars.

HA!  My main riding buddy has the top of the line $7k Look 765RS gravel bike.   He's an automotive mechanic by trade but can't figure out how to properly take care of his chain, despite my offers to do it/show him how.  We will be on a ride and I'll say something to the affect of "Do you wear your ear bud in the right ear because because your chain sounds like a couple of Transformers trying to screw or is it just a coincidence?"

• The frame is frame from Ornan Bike: https://www.ornanbike.com/best-chinese-carbon-gravel-bike-frames-with-flat-mount-type_p106.html
  It was the model R730-D when I ordered, they seem to have changed the model number since. This frame is also carried by Top Fire and a couple of others. I ordered mine in size 480 without a fork. 429 USD without fork, 605 total.
  I've since found this same mold out in the wild sold as the Franco Grimes, any frame spotters seen this one under other names/brands?
• Whisky No.9 CX Fork: I originally planned to use a replica from Ebay https://www.ebay.com/itm/303880803441. This replica is pretty awesome, I used it on my old Poseidon X. It took forever to arrive, so it's now for sale if anyone is interested  I will say the forks look identical except for the finish...even the steerer tubes look identical and the weight is the same. I ended up buying a real Whisky fork locally and will move forward with that one as I've already painted it.
  
• ZNIINO 90mm carbon stem from Aliexpress. Looks nice, cheap and easy to paint. Finishing was a little rough around the edges, but nothing a little sandpaper couldn't fix, I was painting it anyway. https://www.aliexpress.us/item/3256801745113305.html?
• I'm gonna give this Elita One saddle a shot (model 3143): https://www.aliexpress.us/item/2251832622302239.html?
• Zipp Service Course XPLR 70 handlebars. My gf has the road version on her bike and I always thought they were super comfortable and they're pretty cheap, so I got the gravel version in 42cm for this build.
• XPLR groupset: Pieced it together used from various online sources. Rival XPLR derailleur, 40t power meter crankset, 10-44 cassette, and Force chain.
• For shifting and braking I'll be using: AXS wireless blips, TRP RRL brake levers, and Klamper copies. https://www.aliexpress.us/item/3256804206370295.html? I used these brakes for maybe 20 miles on my old Poseidon before we swapped the groupset to GRX 810 and sold the bike to my cousin. We'll see how these ride and I'll post some updates.
• Time Atac XC pedals
• Panaracer Gravelking SK tires in 700x38 for now. I have an old set of these in 700x32 tucked away somewhere as well that I may use for faster rides, but I may just get some slicker tires as well.
• Still working on a wheelset, I'll probably use an alloy DT Swiss set for a few weeks until I sort out some carbon wheels.

• He mentions that the derailleurs are not the only determinant of shifting quality. The supplied chainring, chain and cassette on the Java test bikes are not the best so it's hard to make an apples to apples comparison with the established brands
• FD sucks. He says that it feels like 'last gen SRAM' (not sure if he's referring to RED eTap A1 11s or Force AXS D1 here) where shifting under load especially uphill is difficult
• RD is fine and shifts like 'last gen Shimano' (R8070?) but has chain slap issues (not enough tension?)
• Lever buttons feel like a mouse click and aren't nearly tactile enough. Very mushy like SRAM pre-Rival/Force AXS D2.
• Due to how the inner shift button is half embedded into the leading edge of the brake lever, riding over bumps and uneven surfaces results in frequent accidental shifts
• You can see Joe Whittingham from China Cycling at 2:55 so you can look forward to his first impressions video
• He shifts up and down the entire cassette range at 3:45 and 4:05
• He says that the braking feels improved from the mechanical RX hydraulic he tried before

Direct mount hanger is a option for the rd. I can't figure out where a power cable goes for either derailleur. How do you charge the battery(s) what kind of battery.

Does that mean this hanger will be used for both gravel & road with a fairly big cassette clearance?

I recently stumbled onto the website www.sportpursuit.com  You have to sign up to view their site/prices. (its free) They sell closeouts on cycling and other outdoor gear.  Some crazy deals on there but size selection can be limited at times.