This Vertank (Vertical Tank) is named after the Slavic god of beasts. It's the first Mekton featured in "Mekton Mecha Manual Volume One," way back in 1994. It was just lineart in the book, but I colored it in Photoshop recently. (I admit the coloring job isn't all that impressive.) Anyway, this stuff is copyright and everything R. Talsorian Games, no infingement, etc.
BTW, here's a sketch of a heavy weapons variant: [link]