While googling some Sentai images I noticed something vaguely reminding me of the Xantium-Discovery docked. Taking also this line of thought I compared the Ark and the Astro Megaship. While the designs are different both have the same concept of a interstellar gunship. Am I crazy?
see nothing what you see, sorry mate.... for me they are totally different, it's a generic ship design, often used. look at the ark in animated, clearly Defiant-Design