Saw your post earlier and wanted to chime in before you drop massive cash on the Korean stuff. Honestly the Oberwerth Half Case for Leica M11 with Battery Access is a decent option for the Kyoto trip. It keeps the USB-C port open which is huge if you dont wanna pull the battery every night to charge. The leather is thick and feels premium enough for an M11 but yeah it adds a bit of height to the base. Arte di Mano is beautiful but for a high-intensity street photography trip you might want something more rugged. If you want something slimmer that still has a decent grip look at the Vi Vante Leather Half Case for Leica M11. Its way under your $400 budget and usually ships pretty fast. Another solid pick is the TP Original Leather Half Case for Leica M11 if you want to save money for lenses... it has the battery door and the USB access too. Just check the shipping times since you are on a deadline. Feel free to ask if you want more details on the leather textures.

Regarding what #1 said about the Oberwerth being a decent option, i've used them and they're solid, but they do add some serious chunkiness to the bottom. If youre worried about bulk but still want that artisan vibe for your Kyoto trip, look into the Angelo Pelle Half Case for Leica M11. I picked one up for my M10-R a while back and the leather quality is insane, smells like a workshop in Florence. It has a built-in grip which helps a ton with the M11 balance. Honestly, that silver chrome is way too pretty to leave unprotected on a cafe table. Another sleeper pick that usually ships fast is the Lim's Design Genuine Leather Half Case for Leica M11 with Aluminum Base. I know it sounds less boutique than the Arte di Mano stuff, but it has a solid metal bottom plate that is basically indestructible. It has the battery door and doesnt block the USB-C at all. I used one for a month of street shooting in Japan last year and it handled the humidity perfectly. The grip is actually more ergonomic than the official Leica one tbh. In my experience, you should never settle for a case without the battery cutout. I used a custom case years ago that required unscrewing the whole thing just to swap cards... missed a shot of a lifetime in Paris because I was fumbling with a thumb screw. With the M11 you really want that easy access for the USB-C charging too. Both the Angelo Pelle and Lim's should get to you way faster than anything from Korea right now.

Like someone mentioned, the extra bulk from those bottom flap designs can really kill the ergonomics. Honestly, i have had some issues with the reliability of those cases anyway... the hinges or snaps usually get loose after a few months of heavy street shooting. It is super disappointing when you pay a premium and the fit just isnt perfect or starts sagging. Since youre worried about your silver chrome, just be careful with the inner linings on some of these. I had a case once that actually stained the finish when it got a bit damp, which was a total nightmare. Given your Kyoto trip is so close, id probably prioritize whatever you can get delivered fast rather than risking a custom order that might not show up or fit right. Better to be safe than sorry with a new camera.