I was thinking about her name and registry, and I thought that maybe she should only have something like PT-XX for her name, maybe an NCC which includes her PT number, but no USS as the old torpedo boats didn't have names to them, just their hull number.
Also, I'm getting the feeling that she's a real small boat, with only 3 decks tops, so why do you have the turbolift cylinder behind the bridge module? Unless that's a vertical airlock or something, I'd say get rid of it, or give it a non-turbolift purpose.
just my 2 cents.