Kingston looks neat!
I think it would be cool to explore this concept even further, maybe make it more like a descendant of the NX class, with the nacelles on up-swept, swept back pylons.
But still, Kingston is great!
As for Proxima, hmmmmm... That ain't natural!
The design does raise an interesting possibility, though. Maybe Excelsior started out as a TOS or Phase 2 design in the late 2260's or the 2270's. It would be interesting to see one with either extra-long PB nacelles or maybe early LN's. Cool looking saucer!