Ok, that's pretty cool!
I have a keychain-sized portable server based on a Banana Pi M4 Zero that I thought was compact, but this one wins lol. Mine does a bit more than that, but I've got a smidge more RAM and horsepower to play with than an ESP32. Still, that one does a lot of what mine does (books, movies, tv shows, music) with much less resources. Impressive!
Maybe I'll do a write-up here on my travel server if people are interested.
Edit: By popular demand, I did a write-up: https://startrek.website/post/41991401