I really like what you've done with the Merlin-class (Sorry, but "Merlin" class makes more sense, and allows a totally "magical" naming motif wihtout booboos
,) but I think it needs bigger nacelles. Not that the current ones are horrible, they aren't, but I think they could use some fattenting up to balance out it's looks.
Also, the Merlin could use an Impulse Deflection Crystal or two for it's warp core and impulse engines (unless your telling me that the two blue "slits" on the saucer back are X-Era versions. If not, then what
are they. Arbouretum windows? Rec deck?)
I can't wait to see it's X-Era companions.