Maybe you're not getting where he is coming from. Scaling the ship up without adjusting the specific details is what makes it seem wrong & silly and implausible, and what makes it, in something like your parlance, a MIS.
Make It Stupid.
Hey, it's been 40 pages of thread, and they obviously don't get where he (or previously, me) is coming from. For whatever reason, the thought of massive starships just does it for some people. It doesn't make a lick of sense, but, well... BIG STARSHIPS, YEE-HAH!