How quickly done?
For a quick set of schematics, this isn't half bad at all, and I mean in execution.
I'm guessing that the nose is supposed to look somewhere in between that of the Type-5 and the Type-7 (or whatever is the name for Probert's shuttle design for TNG)?
The ships registry suggests to me that she is from around the same era as the Excelsior and kin.
The only change I'd suggest right now would be replacing the Constellation-like nacelles with something more like that of the Type-5 or similar (but shorter) to the Excelsior's.