These sprites really do not fit in Doom.
It doesn't have to be a Doom weapon...I'm just using Doom enemies to illustrate how it works. But I might end up using DN64's since there's already the Polymorph with the same sprites as this.
Consider what R667 is for. It's a resource of weapons, monsters and things for people to use in their mods, and this doesn't fit the style of Doom, Heretic, Hexen or even Strife (Well, Strife is debatable, but the angle's still way too off to fit in there).
Quite frankly, I would've rejected the Polymorph outright for the same thing.