Does the original tag make sense when the vehicle design is not original?

From original:

Artwork depicting a subject that isn't from any established copyright. Basically, art that is not fanart.

Original has nothing to do with the ideas an artist is portraying, and everything to do with copyrights. If they're not drawing from any copyrights, then it is by definition original.

Removing original tag because the artist stating in the commentary is a Semovente 75/18 due to it's short barrel.