The design isn't a 1:1 carbon copy of an existing Federation starship, since the outpost commander doesn't recognize it. But one wonders... Perhaps the Romulans copied some elements without quite realizing what they were for, this cargo-cult approach explaining the obvious warp nacelles on a ship that fools Scotty into thinking "simple impulse", and the rows upon rows of portholes on a ship where tall people have trouble walking straight.
Or all along, nacelles = "simple impulse" and warp
nacelles have extra greebles on them
I've always liked the idea that the nacelles are the universal impellers that make the ship go
and warp and impulse simply refers to the engine that's powering them - and the red bits are simply minor exhaust or radiating units. Sadly, it's not really upheld very well by canon, let alone fanon.