All these comments about sudden airplanes in a fantasy setting, and nobody has mentioned the OG Nausicaä of the Valley of the Wind, and her noble steed Mehve?! This thing is a direct rip-off... er... "tribute" to Miyazaki's creation. Even the air intake has the same shape!
I'm also amused that he came up with this glider at the tail end of a single chapter thanks to the Alchemy cheat skill, when this same goal is an entire couple arcs of "Rebuilding Civilization starts with a Village" since they have to build the whole tech tree properly without magic.