You might also consider making the exhaust flames a bit more meaty. The little tips look kind of funny but I get the comcept they fluxuate in size but it;s not animated so you can't tell. I assume you have a third exhause in the body, why is it's flame smaller than the other two smaller engines? I think you have the concept "It don't need to fly it's just gotta have weapon support". In space magical things happen you need only large guns to fly! Rainbows and puffs of magical sunshine!!!!