I really like the idea of making a "larger" blade for the Galatine, but there are a few things that I think could be improved.
Some people have already mentioned this seems more like a dagger skin, and I think that the best way to make it look more like an actual greatsword would be increasing the size of the handle, the guard and adding a pommel, while making the blade a little bit thinner (that is to say, make it look a bit more like the actual Galatine whilst not removing its characteristic thickness). Maybe changing the tribals to actual tenno writing would be nice. Also, I don't get exactly what that silver/gray part near the guard is supposed to be, but don't you think it feels a bit weird there? I feel like the blade would be better without it, or with a different thing in its place...