"Any sword that's in Final Fantasy just is way too massive". Ha! Man at Arms is great. Professional swordsmith Tony Swatton makes multiple different weapons from video games in real life and they look incredible. He's already made Cloud's Buster Sword. In this episode he attempts to make Sepiroth's sword, Masamune.
It actually seems like quite a difficult task, considering the sheer length of the thing. The Buster Sword is big, but it's wider, making things easier (I suspect). Watching the process of the work is just really engaging and the sword itself? Well, it looks predictably fantastic.