reliably getting a gun somewhere wont really be a pain if you can move faster than anything else in the game.
12inch range, plus 3d6, which is what, 11, 12? on average
so it's actually a 24 inch range gun, that wipes out entire squads in one shot.
If you line it up right, it can hit several squads, and strength 10 ap 1, is deadly to tanks too.
Living metal ignores shaken and stunned, right? So first turn it turbo boosts 36 inches behind cover, for a 4+ invulnerable save, ignores 1/3 of the damage results (which is pretty darn resilient), then moves 12 more inches and kills half your army.
It only needs one shot to easily win back its points.